Sync pending for this folder outlook 2016 mac

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Any ideas on what can be done? At this stage I would presume that there would be discrepancies with important stuff in the cloud and locally. It's stuck on one small file that it cannot upload, nor does it show the file name - so to move it or delete it or whatever. I should probably move to SharePoint but lack the tech knowledge and time to do it properly.

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I've two folders with plenty of files synced in cca.