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"Couldn't save the file" message showing when trying to update a data source on a chart

In a Looker Report with multiple data sources, when I try to change the data source for a chart (after copy and pasting it) the "Couldn't save the file" message is returned. I have tried closing and reopening the browser, clearing cookies and history etc. but nothing has worked. Has anyone else experienced this? It is a recurring issue for me.

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Hi @georgiasloan, thanks for your post!

Have you tried creating a copy of the chart  (or recreating the chart from scratch) and deleting the old one, or creating a copy of the report and deleting the old one? 

If the issue persists, you can let our team know by filing a bug report here: https://support.google.com/looker-studio/answer/13606940