paul2009

You have done this correctly. Product images should all be added to the first product row and will be imported, but the tool does not automatically assign them to variants. 
After importing the products you must manually assign variant images in the main product editor. To do this, edit a product and, in the Inventory section of the product, click EDIT ALL.

You should see all the variants and can assign images to individual variants by clicking the buttons in the first column:

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It will depend on the version/template you are using. If you are using Squarespace 7.1, you should be able to click EDIT SECTION and then set the Section Height to meet your requirements. If this doesn't help, please see the guidance in How to Post a Forum Question.

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Sadly, this is a Squarespace bug, that they acknowledged on 1 June 2023 but it hasn't been fixed yet. It isn’t something you can fix yourself. 
This video shows me typing "This is me typing a title...":

 
As you can see, it cuts off half way through when cursor focus suddenly moves away from the title field. 
I used the same workaround as you - typed the title somewhere else and then pasted it in.
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Your form needs an Email field. When you set this to Required, an Email Signup toggle will appear.

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You need to manually build each page using Squarespace blocks on Squarespace page sections.

Log on to your website, click Help in the bottom left corner. You'll see the version number at the very bottom of the panel.

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You can apply a style to multiple selectors by separating them with commas. For example:
#block-096b91c3c447c862ff29 a,  #block-7f84764a56c4274b098b a {   text-decoration: none; }  

Squarespace doesn't have the necessary backend code to allow a user to submit an interactive PDF web form online. Your choices include:
Using your current solution, where users download a PDF, complete it offline, save it to their device and then return it by email. As you've pointed out, this isn't a great experience for users who may be confused by the process or not have the skills to allow them to save the form and then submit it. This is a particular problem on mobile devices, which typically account for over 70% of Squarespace visitors.  Build a form using a Squarespace Form Block. This will be difficult because of the length and relative complexity of the form when compared to the Form Block features. Build a form using a third party form provider like Jotform, InvolveMe or TypeForm (these are affiliate links. If you make a purchase I may receive a tiny commission. All opinions remain my own.) You can create really beautiful forms on some of these platforms but the downside is the additional cost, especially for a charity. I appreciate this is not what you wanted to hear, but I hope this helps.
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These free items are currently configured as digital products, so visitors will need to go to the cart and the checkout to receive them. They'll need to provide an email address and a physical address but they won't need to provide payment details (see below)

 
If you only want an email address in exchange for the PDF, there's a thread here that describes how to do this.
If you'd prefer them to be able to download the products without going through the checkout or providing any details, you can add the PDFs to file storage and allow visitors to open/download them.
 

This is the expected behaviour on Squarespace, as they want all card payments to go through Stripe. You can't unlock this feature on Squarespace Commerce.
 

@hollykdesign If you add this to the Custom CSS panel, it should prevent users clicking on the summary block thumbnails and titles (by blocking pointer events) but won't have any impact on the email links:
/* Summary Blocks not clickable on Directory page */ #collection-64d1ad9e5d14547a9a93a726 .sqs-block-summary-v2 .summary-block-setting-show-title .summary-thumbnail-container, #collection-64d1ad9e5d14547a9a93a726 .sqs-block-summary-v2 .summary-title a { pointer-events: none; } Did this help? Please give feedback by clicking an icon below  ⬇️

As things stand today, this is correct. Content does not overlap. See item 12 on my list of current Member Area limitations.
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You can change the date of a post. Blog posts are shown in date order.

This is a feature of the Five template on the older version of Squarespace (version 7.0). Here's a thread discussing this:
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Correct. Squarespace does not pull shipping information from Print on Demand suppliers yet, so you need to create shipping profiles manually, taking into account regions and products.

Folder navigation is a feature of Bedford-family templates on Squarespace 7.0. It isn’t available on Squarespace 7.1.

This happened because of a change by Squarespace.
Squarespace now require this CNAME record to point to ext-cust.squarespace.com instead of ext.squarespace.com. You can change this by logging on to your domain host's DNS Settings and editing this record to point to the new location. The warning should disappear within 24 to 72 hours.
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Check your Squarespace website billing plan. To sell subscriptions you need to be on the Commerce Advanced plan.

It isn't possible to customise the Member Login Popup with CSS because the popup loads in an iFrame (for security). Take a look at this post:
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Squarespace doesn't include an upload feature yet so if you're in a hurry for this feature you'll need to use a third party service. There's a third-party add-on called the Squarewebsites Uploader, you may prefer to look at a solution like Jotform.
That said, there are two important aspects to this question - patient confidentiality/data protection and technical capability - so the solution will most likely depend on your client's legal requirements.
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You can add them as product variants or as related products.
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If you are based in the US, you can use the Squarespace Point of Sale feature of the Squarespace App, in combination with a Square reader. Although the in-person transactions will be processed on Square payments (and not Stripe) all the transactions will appear in Squarespace Commerce.
If you are based anywhere else, you can't use Squarespace POS features yet, so you'll need to use an entirely separate method that isn't integrated with Squarespace Commerce.
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This shouldn't happen. It may be related to the recent font rendering update and, as Squarespace doesn’t use this forum to track bug reports, it would be worth reporting this to Squarespace directly by raising a ticket through Squarespace Customer Care. 

Squarespace were reporting connectivity issues around that time.

It depends what your client means by "multiple stores". On Squarespace 7.1 you can have up to 10,000 products on a single store page or split across many store pages (within the limit of 400 pages per site) but you cannot create your own marketplace with separately branded store pages and separate checkouts.
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