Click on the ? And find files. It should show the expected file path That lightroom is expecting them to be. check your file explorer to see if that path is online. Lightroom thinks it not. If you have a disk that's offline or it's drive lettervhas changed, this is your problem.
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Your files are not "in" Lightroom. Your files are on the hard drive just like your documents and spreadsheets. Lightroom references your images by path and file name. If you have moved or renamed the files outside of Lightroom using Mac Finder or Windows File Explorer, you need to tell Lightroom what you did.
If you have lots of "missing" images, first go to the Library module, Folders panel.
If you have any missing folders "?" you need to "find" those first. LR knows the difference between missing files and files in missing folders. Fixing the folders first should solve most of the file problems.
After you fix any missing folders, then you can "find" the remaining missing files.
but if i didn't move or change folder's name, i just open lightroom and saw those missing folder and file can anyone tell me what cause it since i tried to find those missing file some i couldn't locate I'm getting worry that i will lose them all thank
but if i didn't move or change folder's name,
Lightroom can't find the photos. Lightroom doesn't care if you think you didn't move the photos/folders or change the photo/folders names. Sometimes this happens accidentally and you don't even realize it.
It doesn't really matter why at this point.
First, you need to find the photos using your operating system. Use the search feature of your operating system to search all hard disks for one or more of these photos, by file name. Then, once you know where the photos are, go into Lightroom, click on the question mark icon, and point Lightroom to the location of the photos.