Hi @acondie , the issue is because you have configured in the flow to retrieve only the Top 1 File (Top Count = 1).
When the flow ran today, the existing file is override, and as a result, you are unable to see anything.
so, please remove the Top Count configuration to retrieve all files (Default 100*) from the SharePoint Document Library.

*If you have more than 100 files in the SharePoint Document Library, please enable pagination from action settings and configure the limit.
Additionally, consider using the filter query (highlighted above) to retrieve and process files that are not created in OneDrive based on specific conditions.
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Thank you,
Harsh Deol