IDML missing links
Mac OS Mojave. INDD 2020. (Also with previous versions.)
Save a INDD file as IDML when all linked images are "up to date". Reopen IDML in same or other INDD version, frames of some images are visible, but content is missing. There is even no link in the links panel. Occurs when "save as" IDML; when package + IDML, with and without relink images.
Occurs when files are stored on server or when stored on local computer.
Only constant I have been able to find is that these images are rotated or flipped.
Don't tell me this is "expected behaviour" or a limitation of the IDML format....

