P: Desktop: All edits done, lost.

Using the latest Lightroom (Cloud) on M1 Mac and when I edit a photo, my edit-changes are not saved when I quit Lightroom after editing... I have to select second picture after editing the first one, then changes get saved for the first (can replicate this anytime). Is this a known problem?

This thread is being merged into an authoritative thread for better tracking and response. 

There is a bug in Lightroom where you lose the edits of a picture if you quit Lightroom with this picture still selected in edit mode. Either go back to the grid, or select another picture before you quit Lightroom.

After the latest update the edited pics go back to the unedited form when I open LR, Why??

*Drazen  you wrote "Well, if the car is not working, then I can't bring it over to the mechanic. And I'm not a mechanic myself, to know what's wrong."

Sorry, didn't make myself clear!  What I was trying to convey was that specifics about the components and model of your computer would be very helpful in order to try to assist you in figuring this out. 

Also, you wrote "I'm not supposed to click Save after editing a photo, do I?"

The answer is YES, because if you do not save, then the version of the file that was on storage is not updated with your edits.

*Drazen 

There are two issues at play here.

1. There is a bug in the current version where quitting while in the edit screen fails to commit the edits to the image and sync them to the cloud. The workaround for this is to select another image or go to grid and unselect the image - either of which will force the edit commit and initiate a cloud sync.
2. You are using LIghtroom in an atypical manner. LIghtroom is not designed as a one image editor - meaning you don't typically open a single image, edit, and then delete the image. Lightroom is designed as a catalog and editing tool. Using it in this manner will likely cause unexpected issues as it is an unexpected use case. 

Until the bug is fixed, please use the workarounds in step 1 to ensure saving of your edits between sessions. 

Aha! A conceptual problem here.  Adobe does not "have a file system." One does NOT save files "in Photoshop" nor when using any other program. Files are saved in your storage media, whatever that might be, in a file system / format system depending on which you are using, Windows or Apple, in a structure which you can visualize in a human friendly display. With Windows there are Directories (also called Folders) which the computer can locate and store or retrieve depending upon user instructions to save or open a file to or from storage.   I used to have clients (I had an IT Support business for many years) who would say to me something like this: " I saved it in Word!" when they actually saved the file in a directory within Windows file system. What was always the problem was that the save had been to a different place than the user thought because they had saved something else earlier and failed to notice WHERE the document was being saved.

So, perhaps in this case, possibly a Save command given to Photoshop placed files in unexpected places, or perhaps the user had expectations that Photoshop itself had the work tucked into a little place in Photoshop, and didn't understand that you do NOT save files inside software programs. If the latter is the case, and, as the OP stated, he or she simply left the computer open for a while and shut it off without actually saving the file after making edits, then that is pilot error.

@Rikk No, I hate Adobe's file system so once I finish editing a photo and obtain the final file, I delete it from Lightroom and I don't save it in Photoshop. I always just have the photos I'm editing at the moment. Most times, that's just one.

I might have left the edit screen open for several hours, before turning off my MacBook. Are you saying it won't save ANY edits if I do that?

@DGrainger Well, if the car is not working, then I can't bring it over to the mechanic. And I'm not a mechanic myself, to know what's wrong.

I usually edit a photo in Lightroom, then open it in Photoshop to make more changes, then save it as a JPG.

Yesterday, I edited the photo, but before opening Photoshop, I decided to get all the photos I was planning to add to an Instagram post, to batch edit all of them. I took longer than expected, and after a couple of hours, just turned off my MacBook.

I'm not supposed to click Save after editing a photo, do I?

Well, I open Lightroom again today, and the photo is there, without any edits. They're gone. What happened? I don't know. I'm not a mechanic.

Earlier in the day, several updates downloaded and installed automatically. That's all I can think of

I am sorry to hear about the difficulties.

After editing, did you move to another image or did you close the app while still on the edit screen for the image that lost its edits?