When opening a document in FYI to edit it, there is a long delay opening the file.
This may also sometimes display the following error:
'Sorry, we couldn't find "https://...". Is it possible it was moved, renamed or deleted?
This error can be caused if your OneDrive is often or permanently syncing. When opening documents via OneDrive. It is commonly caused if you are syncing a very large number of documents, or if the documents that are syncing are very large.
Refer to the article In FYI "Sorry we couldn't find 'https://...." when opening documents for Edit in Desktop and for OneDrive Syncing.