With Auto save off the only way to save was a small SAVE label in the
corner of the preview bar, easy to miss.
A row between the bar and the picture now says "Not saved yet" and holds
a solid button: Save picture, Save all 4, Save this one, Save the rest.
After a save it says what is saved, with the file's name for one picture.
The row shows only while the node holds pictures, takes its own room so
the picture keeps its floor, and stays with the preview off.
The button is primaryAction in the shared panel controls; the wording is
keepWords, with a test.
ausboss
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