I'm currently getting the same error and don't know how to fix it. It happened after I agreed for some "recommendations" appeared when making an "Archive". It was said something unclear about some "enabling app symbols" or something like that. I don't what what it can all mean, Apple like such confusing things. Now I can't find anything about these "symbols" and how to disable them ))))

I'm wondering why this issue is still not fixed. For me it worked more or less fine for English screenshots (I had to upload them through "All sizes in Media Manager", because the main page uploads didn't work), but when I started to upload localized images - nothing helped, everywhere all uploaded images dissapeared and then were marked as "no yet been uploaded". I thought that maybe AdBlocker causes this buggy behavior, but it doesn't. Please, fix this finally!