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.
Click "⋮" then "Export Text"
Match these settings exactly. Export format: TXT, Include speaker names: ON, Include timestamps: ON, Merge same-speaker segments: ON, Export as monologue: OFF, Remove Otter branding: ON. Click Continue.
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 TXT file.