What this converter actually supports
Published audio routes run through the deployed FFmpeg toolchain. The converter probes the source stream before conversion, and files without a decodable audio stream cannot produce an audio result.
Use WAV for editing and interchange, FLAC for lossless storage, or MP3 and AAC for smaller delivery files.
The public upload limit is 1 GB. Convertr does not reduce dimensions, duration, resolution, or output quality merely to manage worker load.