Saving errors concerning flash drives

Recently I was editing a pdf file, specifically adding annotations to the material, off of an external flash drive. I ended up leaving the computer alone for a while, having not saved the file and put the pc into hibernate. While it was in this state, I ended up removing the memory stick so that I could put a different file on it onto another computer. After have done this, I returned to the original computer that I was using to the edit the pdf and took it out of hibernate. I plugged my memory stick back in and clicked on the pdf in question to continue adding annotations. Most of the pages of the pdf were blanked out, and any attempt made to save the pdf was met with an error message: "The external volume of the file has been changed, so the copy open is invalid". Eventually, I closed the file without saving and opened it up anew from my memory stick: in the past, this has prompted the system to grant an error message saying that the file in question did not shut down properly and restore the lost data. In this case, it did not work. Can anybody explain to me exactly what has happened in this situation, what has happened or not happened to the edits I have made, why there is no automatic backup like usual and how this state of affairs can be mitigated, now and in the future?

If you take a memory stick out and put it back, the system doesn't pick up where it left off. Rather, it behaves exactly as if it were a different stick. Programs that were using file on the stick are left high and dry, and there is no way to recover them except to reopen the files - it may not be possible to close them.
Furthermore, removing a stick without shutting it down may leave files half written and permanently damaged, and this is true whether you are hibernated or not.
Never remove a stick for files that are in use. For safety, never remove a stick while hibernated. Instead, always use the "Safely remove hardware" feature while the system is running. This will reject any attempt to remove a stick where something is in use.

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