Upload file image to existing field

I’m creating an app to track industrial projects. I want the user to be able to upload images to an existing collection but within the field. For example here is a collection where you can see the project name, address, and some notes. Is there a way the user can choose which project to upload the image to and for it to save in the field?

I already know how to upload and image the problem is how to save it in a specific field for a specific line

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