I opened a number of tabs at the same time. I think that’s why Google Colab was not able to support the heavy load. The message stated:
Save failed
This file could not be saved. Please use the File menu to download the .ipynb and upload the notebook to make a copy that includes your recent changes.
Is downloading the file and uploading again the only solution?
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Answer
This can happen if you open the same notebook in multiple tabs and make incompatible edits to the notebook. At this point, the only way to save your work is to follow the advice in the dialog. To prevent this in the future, avoid simultaneously editing the same notebook in multiple browser windows.