Issues viewing epicollect images

I have several photo requirements for an epicollect project. I can view some of the photos in the browser data viewer. Others I cannot (all I can see is the epicollect logo). The same thing happens when I download the .csv file and try to open the photo links manually (some photos show; for others, I just see the logo). Did I lose all of these images? Is there a workaround here?

It looks like some photos were not synced.

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