Auto-saving transcription files in a folder?

Short answer: No, Microsoft Teams does not currently support automatically saving meeting transcription (.vtt) files to OneDrive or SharePoint in the same way it does for recordings.

When a Teams meeting is recorded, the video file is automatically stored in OneDrive or SharePoint depending on who started the recording. However, transcription files are not automatically stored as standalone files in those locations. They are stored as part of the meeting artifacts and are accessible through the Meeting Recap experience in Teams.

Because of this design, the only native way to obtain the .vtt transcription file is to download it manually from the meeting recap.

If your project requires automation, there are a few possible approaches:

1. Use Microsoft Graph API
   The transcription files can be accessed programmatically using Microsoft Graph. Microsoft Graph allows you to retrieve meeting transcripts and download the associated .vtt content. This is the most common approach for automation scenarios.
2. Use Power Automate with Graph
   You can create a Power Automate flow that calls Microsoft Graph to retrieve transcripts for meetings and then saves the file automatically to a SharePoint or OneDrive folder.
3. Use Teams Export APIs (compliance scenario)
   In some tenant configurations, the Teams Export APIs can be used to retrieve meeting artifacts including transcripts for compliance or analytics purposes.

Important limitation:
There is currently no built-in setting in Teams Admin Center or Meeting Policies that enables automatic storage of transcript files in SharePoint or OneDrive.

Recommendation for automation projects:
Use Microsoft Graph meeting transcript APIs to retrieve the transcript and then store the .vtt file in SharePoint or OneDrive through automation. This is the supported way to build automated pipelines around Teams meeting transcripts.