iTunes silently refuses to import .AAC files
iTunes purportedly imports AAC files (according to Apple support https://support.apple.com/guide/itunes/convert-music-file-formats-itns2972/mac) . Yet when importing some AAC files, it silently rejects the file. Bug 1: the import doesn't work as documented, Bug 2: it does not put the file into the "Not imported" folder as documented. Bug 3: It does not notify the user of the failure.
The first attempt was files converted into AAC (from .WAV, a non-supported lossless format) using "High Quality" (256 kbs/44k Hz sampling rate). The second attempt used the "Normal Quality" (128 kbps/41k Hz). Both attempts failed as described.
PS: The point for me in doing this is to consolidate my library into AAC files wherever possible so that multiple players (ie, non Apple) can play them.