There shouldn't be any restrictions per anything. Check if you have version control enabled. Each version uses space so even if you only have one 50GB file, 11 versions would max out your allowance.
I have proton unlimited. That should save up to 200 versions of each file for 10 years.
Thank you for updating us on the resolution of this! Glad you could make it work.
@Papanca Moving to Nextcloud ?
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