Can this be a feature where we can just link receipt images from Google Drive, OneDrive, Dropbox, etc.? This would be a convenient option, as there would be a single upload point.
Brilliant idea, but have you tried with custom fields ?
Create a custom forward for the relevant data entry point and use it and let see, just paste the file link there. I’m not in the position to try it this very moment but I’m sure it may be highlighted as a hyperlink and you view the document and you could click and view the linked file. Give it a shot.