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Projects are auto-saved every two minutes and your browser will likely prompt you if you are navigating away from a page without saving. However, if you're experiencing trouble saving projects, here are some suggestions on how to fix it.
Size of Sound or Image: If a sound or image is larger than Scratch's maximum file size (10MB), then the project won't save. In this case, a pop-up will appear that reads “Project Failed to Save.” You should be able to save by cutting the sound into smaller pieces.
To cut a sound into smaller pieces, try this:
1) Click the Sounds tab and pick the music or sound file that's long.
2) Select a section of the sound, starting from the beginning.
3) Click the "Copy to New" button. (If it doesn't create a new sound, the piece is too large, so select a smaller region.)
4) Select the next section of the sound. Click "Copy to New" again.
5) Repeat the process until the whole sound is broken into pieces.
You can now play the sounds one after the other. Click the Code tab. Snap together "play sound until done" blocks to play each of the sounds in a row.
Project File Size: Another thing that can cause a project to not save is if it is a particularly large project with lots of sprites and code. Scratch stores information about the project in a file called project.json which has its own file size limit of 5MB. If you have a file with many sprites and lots of code, try using fewer sprites/blocks or make your code more efficient using features such as clones and Make a Block.
Internet Connection: A project may not save if you lose internet connectivity while trying to save. If you lose connectivity, you can save a file on your computer by click File on the top menu, and selecting "Save to your computer." Later you can upload it again by opening a new project and choosing File > "Load from my computer."
Signed Out: Another thing that frequently causes people to be unable to save is if their account gets signed out. This can happen if an account is signed in to more than one computer or if more than one account is signed in on the same computer. It usually happens when someone is working both at home and at school, if more than one person is sharing an account (which we don't recommend), or if two people are working on the same computer.
To prevent getting signed out, don't share Scratch accounts with others and only sign into one computer and account at a time. Also, make sure to sign out when you're done using Scratch on a school, library, or other shared computer.
Network Outage: As with all websites, Scratch’s network may experience slowdowns or outages from time-to-time. If you are trying to save during an outage, you may experience difficulties. In that case, you should export your project and try to save again later. Your exported project will serve as a backup to ensure no work is lost.
Editing Another Scratcher’s Project: Some projects are so amazing that you jump right into coding before realizing you never made a copy of the project to your own My Stuff folder. While it's true that anyone can "see inside" a project and can even appear to delete code or make changes, changes by others are not actually saved. The only person who can make changes is the project owner.
Need to Refresh: Especially if you have been signed in for a long time, you may need to sign out of your account and sign in again. Remember to save any projects you've been working on to your device before signing out!