I go into an older subfolder to copy a file into this month's folder. I select the file in bridge, and whether I select 'Copy' or 'Copy to', when I get to my destination and try to Paste, I am greeted with a message it's no longer available. Such as:

Cannot Copy
"C:\users\Photo\Pictures\BelvoirEagle\2020\July\ACFT Training\Army%20Combat%20Fitness%20Test%2081.jpg"
The item is no longer available