Hi AndresAlf,
Thanks for choosing Microsoft. I’ m glad to offer some help.
Per your description, it seems that you would like to update the linked Excel file to PowerPoint in SharePoint.
Given this situation, if my understanding about your scenario is correct, I test it on my side, when I create a presentation and Excel workbook in SharePoint, then link the worksheet to the presentation, once I update the workbook data, the presentation can also get the update data with the link file. See the below screenshot:
The previous workbook:
The updated workbook:
However, if I open both workbook and presentation in desktop app and update the data, the linked file also can automatically update.
May I know my steps are same as yours? If not, could you please point out and how you update the links? And please capture the screenshot of the error with us, we are willing to further investigate it and test again.
Appreciate your cooperation in advance.😊
Best regards,
Gloria