P: Spot Channels do not Save automatically because?

I've never lost any channels on saving. If this is happening to you regularly I would suggest raising it in a new thread along with full system details, Photoshop version details, and as much information as possible about the file structure and steps to reproduce, so that others can try and replicate. Include in that information what format and drive you save to e.g. is it a network drive?

Tagging onto the end of a 9 year old thread which already has information  from staff saying it was fixed, and has not had anyone comment about the problem since 2015 is unlikely to draw much attention from developers.

Dave

I actually do my work in regular channels first and try to make sure that they save properly in the original and as a backup copy, so it isn't only not saving my spot channels. After I have a file that did save the regular channels, I convert them to spot and save the file as the original and a copy again to make sure that those spot channels save before closing the file. Yesterday, I was distracted by another issue and did not get a chance to save and open my copy to ensure the regular channels saved properly before I left for the day. I came back in this morning and opened my file to see that all of my channels (other than the RGB) were gone. They had not been converted to spot yet and were just regular channels. Sometimes, I have had to copy each channel into a layer and save the layered file, then I copy and paste each layer back into channels of a new file because sometimes Photoshop just refuses to save my extra channels in particular files at all, no matter how many save and save as attempts. I wish I knew why this was happening. It happens to me a LOT, which is why I save extra file copies and have my process. I'm just frustrated because yesterday I didn't get a chance to do my usual big process to ensure channels aren't lost, and of course, they were lost.

I've never made spot channels, but can these be copied to regular channels?

In that case a script might be possible that checks if you have spot channels and duplicates them into regular channels. This script could be set as an event script on closing any document.

It's a workaround of course — not a real fix.

It has not been fixed in the current version of CC. I still randomly have my channels not save. Because of the frequency of this error occuring, I have gotten in the habit of saving a copy of my file in a different folder location and then I open the original again to make sure everything saved before I close the files. Most of the time, channels are saved properly. Some times, especially when I'm in a rush and forget to save my backup copies, it does not save the channels. This will randomly happen both when I have not yet converted my channels to spot and saved and also after I have converted my channels to spot and saved. When will this issue be fixed so that Photoshop saves ALL information? Why would the program let me spend hours working exclusively in the channels to just not save any of the work I did? I am using this for work for screen print separations and the glitch is wasting company time.