I created a file with an alpha channel and chose "Save As" to save a psd. The alpha channel I created was missing from the file. However, choosing "Save A Copy" revealed an "Alpha Channels" checkbox that was deselected. I selected the checkbox, saved the psd and now it works. I can also choose "Save As" again and it will save the alpha channels as expected.
This seems like a permanent toggle that is applied to all save methods but only shown on one save method. There are other options missing too, like "Notes", "Spot Colors", and "Layers". I don't understand why the options are missing from the Save As dialogue when the format remains the same.
TPinkerton • Adobe Employee, Nov 18, 2021Nov 18, 2021
This is most definitely a bug. Thank you for bringing it to our attention. It's correct for the controls to be missing when the Legacy Save As preference is turned off (long story), but the actual settings used to save the file should not be secretly turned off - that's a serious problem. In fact, the very point of the missing controls is to prevent these settings from being turned off for a "Save As" operation. The "Save As" command is supposed to guarantee that everything in the document is pr...