Thanks for the reply, tomos.
How do you access that autosave setting, please? Can't seem to find it.
I have "show post capture dialog" set as after-capture preference, so that I can set any caption I like. The program seems to auto-save, and that clearly is not desirable with this little glitch. How, please, do I set it not to (auto-)save until I have added caption and spliced out any content?