I think you are fine. If it works like other application it’s just a copy of the file that still resides on you pc. Delete from the sent folder and it still remains on you pc. If unsure try one. Make a copy of the file on your pc. Delete the item from the sent. Noe see if the original file is still on your PC as well as your copy. If both are there your safe, just delete the copy you made earlier. If it’s gone then rename the copy back to the original file name.