What do you mean?
In the Glide dashboard, you can duplicate your app and “copy the sheet” (duplicate the data) so the new duplicated app is a full backup of your original project. This is mandatory before you start doing major troubleshooting. This is step 0 before anything else. If you haven’t done this, then do it and don’t attempt anything else until you’ve done this successfully.
I’ve make it but the table is no more linked with the Excel.
And I think that it will be not possible to make reversed step.
On this duplicated app with tables that are now there as Glide tables, you cannot connect to Excel in >Settings >Integrations?
Yes but I’m already connected
Still connected to the same Excel worksheets?
I’m running out of ideas. If you are on a paid plan, such as the Team plan, you can contact Glide support 
I’ve tried to connect to an another worksheet with less data but the result still the same.
I have already create a ticket, I hope to have a response this day :s
Hi Quentin 
Any progress on your side or answer from support?
Hello @nathanaelb, My problem is solved !
It’s due to a formula expended on a too large number of lines.
So Glide don’t have the capabilities to retrieve all the data.
Thanks for you help !
Have a nice day.
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