Similar to the issue with trailing slashes,
---
permalink: /kotchka
redirect_to: https://cdn.discordapp.com/attachments/543908157794156584/806716371244548126/[REDACTED].m4a
---
will 404, while
---
permalink: /kotchka
redirect_to: https://cdn.discordapp.com/attachments/543908157794156584/806716371244548126/[REDACTED]
---
will not 404. This is an issue because I cannot include the proper file extension.
CCing @s-chizhik in case they know, but it's a long shot.