Same file "stuck" on top of file list in "Attach File" drop down

Outlook version
Outlook 2013 64 bit
Email Account
IMAP
#1
I use Outlook 2016 on 3 desktops and 3 laptops. This problem only seems to occur on one of my desktop systems.

Normally, when I compose a mail message, and want to "Attach File" I click on the Insert tab and then "Attach File." This action causes a drop-down to appear with what seems to be a list of recently saved files (WORD, Excel, PDF, etc). This list seems to update over time such that the most recent file is on the top of the list. In fact, if I work on a file and then save the file, when I go to attach it to a mail message it most often shows up on the top of the list.

Over the last month on only one system, I have an Excel file that is "stuck" on the stop of this drop-down list. It is like the file is "pinned" in that position on the list.

I really want to get this "stuck" file off the list for several reasons including I'm no longer actively using this file.

I don't know if it is part of a Windows 10 recent file list; a separate list associated with Outlook, or something else. I thought it would clear over time but it does not seem to be fixing itself. I have done Google searching for an answer; but so far have come up empty.

Thanks for any and all assistance.
 
Outlook version
Outlook 2013 64 bit
Email Account
IMAP
#4
Well, I have spent hours on this problem and I have solved it by mere accident. Turns out that the file "pinned" to the top of the Insert File drop down was a file that is stored in a OneDrive folder that has been shared to me. I'm not sure if that file was still "open" in another account which made it the "most recent" giving it top billing on this list; or there is some kind of sort order to files that are not part of my OneDrive account. I actually also own the other OneDrive account so I logged into that account, opened and closed the file with no changes. I then rebooted and went back to my original Outlook and viola! the "pinned file" was no longer there.

I am using many OneDrive folders that have been shared to me--that I do not own. I'm not sure I am aware of all the ins and outs of sharing these files with regards to attachments in other programs like Outlook.

Thanks for your help Diane.
 
Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange
#5
Thanks for the update. I'm guessing there was something that caused it to look like it was always updated. AFAIK, onedrive files don't get top billing in the file list - they never do here.
 
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