Steps to recreate (only tested in OS X).
  1. Attach a file to a thought. 
  2. From the tab menu for that attachment, choose Copy.
  3. Go to the Finder. Find a file, select and Copy (⌘+c)
  4. Activate a different thought. 
  5. Click the + tab to add an attachment. 
  6. Click Paste.
  7. The file you copied in step 2 will be pasted. Not the file copied in step 3.
macOS 10.14.6
TheBrain 11.0.119
Confirmed and documented.

Thanks Alex,

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