If you create a transcript file through Otter.ai, Buzzsprout can import and automatically format the file for you. To do this you just need to export the correct file type.
Step 1
Click "⋮" then "Export Text"
Step 2
Match these settings exactly: 
- Export format: SRT
 - Include speaker names: ON
 - Add line breaks automatically: ON
 - Max number of lines (1-10): 2
 - Max characters per line (5-200): 32
 - Click Continue
 
Step 3
Take the file exported from Otter.ai and upload it to Buzzsprout. Start by clicking into your episode and then find the "Add a Transcript" button on the right sidebar.
On the next screen, you'll see the button to upload your Otter SRT file.
Note: Check your file for colons. Colons can cause formatting problems when uploading in Buzzsprout, so you will want to remove those before the export!