Create Planner plan inside MS Teams standard channel, can we force the documents storage location

Hi johnjohn-Peter,

when you create a new task in a Planner plan and include a file, the system automatically saves it in the default document library linked to your plan's Microsoft 365 Group.
Unfortunately, there is currently no built-in option to modify this default save location. The files are stored directly in the Document library of the Team site rather than within the standard channel folder.

However, there is a workaround available. You can create a designated folder within the document library and upload files to it. Then, when adding an attachment in Planner, choose SharePoint and select the files from the created folder. This method allows you to organize your files within a specific folder in the document library.
Microsoft Planner: change default file storage location - Microsoft Community

Acknowledging your need for more flexibility, I suggest giving your feedback to Microsoft directly from Planner.

You can also post your feature request in Microsoft Feedback Portal:
Ideas · Community (microsoft.com)