If you’re using windows, ever have trouble pasting into photoshop from an external source (e.g., a screenshot)? Photoshop uses an internal clipboard, which is supposed to check in with the environment to see if it has anything fresh to grab, but this fails (a lot).
A simple registry update will fix it. Run regedit, and navigate to HKEY_CURRENT_USER, SOFTWARE, ADOBE, then your version of photoshop. Create a new DWORD named “AlwaysImportClipboard”, and give it a value of 0000001.