Your collection file is too large to send to AnkiWeb

[Danika_Dakika]

I’m glad you worked it out. Yes, excess HTML is almost always the problem. See: Constant Errors Uploading / Sync - #4 by Danika_Dakika .

@womeda2

I suspect that this issue may be related to me using FSRS Helper to to reschedule all the cards too often, in combination with the ~15k cards currently in the collection.

That won’t ever be the issue because rescheduling through FSRS Helper doesn’t add to the size of the revlog.

@womeda2

There’s lots of audio media on the cards, but I’ve read that such information would not be applicable in this situation.

That’s correct. Media doesn’t count toward the collection-size limit. Are there limits on file sizes on AnkiWeb? - Anki FAQs