Scores not syncing to "My Library"

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Hi there,

My apologies if this question has already been answered elsewhere! If so, I've been unable to find it.

I'm a big fan of IMSLP, so much so that I bought a subscription in order to support the project, and I've begun to use the app as my go-to digital library. However, I'm finding that a number of the scores I've added to the app simply refuse to sync. This is very frustrating, as I use IMSLP across multiple devices, and I've been unable to find any troubleshooting support online. Any help would be greatly appreciated.

Thanks much!