Jul 22, 2011 Fortunately, this is easy to reverse and if you wish you can switch the behavior and instead show Library all the time with a quick terminal command. This tutorial will detail four different ways to access the User Library folder in Mac OS X from Mt Lion and beyond. Dec 27, 2019 Unhide User Library folder. This method is for Catalina, Mojave, High Sierra, and Sierra. Older versions of macOS require a Terminal command to be run in order to permanently unhide the user Library folder. Apr 27, 2019 Sorry that was not very clear - if you open your iPhoto library by mistake with Photos 4 (Mojave)- it will upgrade the data and the library to an Photos 4 library - I did this once by double clicking the library and was not paying attention when it asked to upgrade the library - luckily I had a back up of the iPhoto library and was able to revert / and keep the iPhoto version.
Back up your library
Mac Mojave Install
Before following any of these steps, it's a good idea to create a backup of your photo library, even if you use iCloud Photos. You can use Time Machine, use a third-party backup solution, or copy the library to an external drive. By default, your photo library is stored in the Pictures folder within your home folder.
Make sure that your software is up to date
Photos is part of the Mac operating system. You can avoid or fix many issues by running the most up-to-date version of macOS. Learn more about updating the software on your Mac.
If you use RAW images in Photos, learn more about the digital camera RAW formats supported by iOS, iPadOS, and macOS.
If you have trouble migrating an existing iPhoto or Aperture library to Photos
You might see an alert message when you first open Photos or migrate an existing iPhoto or Aperture library. Library prefrences in java mac. Learn what to do if Photos can’t copy or create a library.
![Mac Mac](https://cdn.macpaw.com/uploads/images/plist%20files.png)
If the Media Browser isn't showing your photos and videos
Use the Media Browser to make images from your photo library available in other apps, like Pages and iMovie. The Media Browser shows only the contents of the Photos library designated as the System Photo Library. If you have more than one Photos library—and the one you're using isn't set as the System Photo Library—the Media Browser won't show its contents.
Follow these steps to designate the current library as the System Photo Library:
- Choose Photos > Preferences.
- Click the General button at the top of the Preferences window.
- Click Use as System Photo Library.
If you're having other issues with Photos
If you're experiencing other issues—like missing or blank photo thumbnails, unexpected behavior, or if Photos won’t open—try to see if it's an issue with your library by following these steps.
Create a new Photos library and see if your issues persist:
- Quit Photos.
- Press and hold the Option key while you open Photos.
- In the dialog that appears, click Create New.
- Give your new library a name, then click OK. Note whether Photos opens successfully with this new library.
To return to your main Photos library, quit Photos. Then open it again while holding the Option key, select your main library, and click Choose Library.
Alternatively, you can open Photos in another user account on your Mac and note whether Photos opens successfully.
If Photos opens with the new library, or in a different user account, it might mean that there's an issue with your library. Follow the steps to use the Photos library repair tool on your main Photos library.
Learn more
Where Is The Library In Mac Mojave
- Learn how to create and order print products like books or calendars in Photos with Project Extensions.
- Get help with iCloud Photos.