Is there a way to show users a thumbnail of the image they uploaded?

A thumbnail is automatically shown if it's a single image (multiple images won't show a thumbnail).

Screenshot of an image upload question. An image thumbnail is shown, overlayed with the text, "UPLOADING (75%)."

Otherwise, the file name is shown for each upload with no preview.

Screenshot of an image upload question. The names of four files are listed, each with its own percentage for upload progress.

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What size limits are there on file and image uploads?
There are size limits on files your respondents upload to forms, depending on your plan.
Can my audience upload files to Paperform forms, and how do I make that happen?
Yes, you can add a File Upload or Image Upload question to your form.