How to "delete" attachments in online storage?

Hello! I wonder if there is a way to remove file attachments from my online library.

I use Zotero as local installation on MacOS 10.15.5 and I used the setting "automatically sync with online library" and "sync file attachments". Since my library became to big to sync all attachments I only want one Group folder to fully sync with my online library. My personal library shall only sync the data, no files anymore.

I already tried to uncheck the box for "attachment sync". However, my online library still includes all attachments. I even tried to reset my online library - but still all attachments online.

Is there any other trick I can apply?
Thanks for your help in advance :)
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