Sudo chmod -R u+rw /Dropbox. Sudo mv /.dropbox /.Trash/dropbox.old. Sudo chmod -N sudo mv /Library/DropboxHelperTools /DropboxHelperTools.old (Note some of these commands didn't actually do anything. I think they were just trying to be super thorough.) Open the.dmg file from step # 2 and double click the Dropbox icon to install Dropbox. A while back, a similar situation was faced by me when my Dropbox was not connecting. While the issue was with my network connection, chances are that there could be a problem with the app as well. If Dropbox won't open on Mac or experience connectivity issues, then follow these tips. Solution 1: Check the network connection.
To quit (close) a Mac app in the normal fashion, choose Quit from the app's menu in the menu bar or press Command (⌘)-Q. If the app doesn't quit, follow these steps to force the app to quit.
How to force an app to quit
Press these three keys together: Option, Command and Esc (Escape). Or choose Force Quit from the Apple menu in the top left-hand corner of your screen. (This is similar to pressing Control-Alt-Delete on a PC.)
You can even force the Finder to quit if it stops responding: select Finder in the Force Quit window, then click Relaunch.
Learn more
How to force an app to close on your iPhone, iPad or iPod touch.
Back up your library
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.
Is there a whiteboard app for macbook. 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
https://bucksbrown.weebly.com/blog/mac-app-for-json. You might see an alert message when you first open Photos or migrate an existing iPhoto or Aperture library. Learn what to do if Photos can’t copy or create a library.
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:
Dropbox App Won T Open Mac
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.
Dropbox App Won't Open Mac
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. Mac apps like skitch bot.
Learn more
Learn how to create and order print products like books or calendars in Photos with Project Extensions.