Zotfile issue with Get from file function

Hey, I am using Zotero 5.0.97-beta.46+4cfa23050 with the Zotfile plugin.
I tried setting up a workflow between Zotero, and Goodnotes on my iPad via Dropbox.
First used 'Send to tablet', which works. After annotating the file in Goodnotes, I export it to the same Dropbox folder where the old version of the pdf gets replaced. But when trying to import to Zotero with "Get from file" Zotfile throws the following warning:
"was manually moved and does not exist." But the old and the new file do have the same name. And without changing the file the reimport works, too.
What might be the source of this problem?
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