Heya! I have a suggestion.
I was using FigJam normally, but noticed it was not syncing, I was wondering why, so I opened my project in the browser to check if there were a difference, and I noticed that some images were not in the project. Thinking that all would appear I closed the desk app, but no, suddenly in the browser, all the “Phantom images” that were in the app disappeared, and came to the obvious conclusion: The images were uploading, but I didn’t knew of it.
Honestly, I have a slow connection, but with Figma that is not a problem in general, but uploading anything beyond a Mb is matter of time with anything.
So, I propose to put a little status bar below or inside the image/content, showing the current progress of its upload to the project.