Click on the Apple logo in the top left of your screen and choose About This Mac. Next, click the Storage tab. This will show you how much storage you have available and how it's used. The smartest thing to do is make an occasional overview of apps that you have on your Mac. And if you want to know how much storage space your apps are using, you can easily access this information. To do so, click on the Apple icon in the left corner, select the option called About This Mac, and choose the Storage Tab when you see a pop-up window.
Where are you storing your Photos Library? By default, Photos will create the library in your Pictures folder on your Mac on your start-up drive. How can i clean up my mac for free. If there is no more free storage on your startup drive, you need to remove files and folders to an external drive to make room for the system to work properly. You should not let the amount of free storage on the start-up drive drop below at east 10GB of free storage, as a rule of thumb.
Consider to move your Photos Library to an external drive. This is described here: Move your Photos library to save space on your Mac - Apple Support
How To Get More Space On Your Mac Drive
Occasionally you may be seeing the error message you quoted, for a completely different reason, for example, if your Photos Library is on a drive that has permission problems, or if you disabled the Photos > Preference > General > Importing: Copy items into the Photos Library.
How To Get More Space On Your Mac
Nov 28, 2018 2:14 AM