Hey there, currently I am experiencing some issues with all synchronisation systems. On all my devices (Windows, Android and iOS) I can't upload anything. Yesterday it was still working on Windows, but today I updated to version 12.5.10 and now, no upload is possible. Neither on Dropbox nor on Onedrive or UrzaDirect.
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What error do you get? Can you try on a browser and check what the f12 console says?