Sync settings for attached data (no sync) ignored

Hello,
I started a new offline collection with about 40 items, most with a pdf attached and wanted to sync it to a new registered account. I unchecked the box for file-syncing for my account and for my new group. I started a syncing-process manually which seemed to take a long time, but finally it finished. Now I saw that in my library online all my pdf-files appear, which are in fact quite large, thus my initial wish to avoid uploading all of them.
After that I added most items to my group library and started another manual sync, which doesnt seem to come to an end by now.
Have I done something wrong or is this a bug with ignoring my settings? Is the now long lasting syncing process just related to the troubles with the server (popup says: syncing with zotero server, waiting for sync-server), a user error or a bug with the file syncing?
Thanks in advance

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