The free plan provides 5 Hours storage space and 100GB monthly bandwidth, basic podcast stats, etc.
The free plan supports mp3 file format.
The stereo bit rate and sample rate for audio files are:
Stereo Bit Rate: 128 kbps
Sample Rate: 44.1 kHz
You can also upload images in .jpg, .gif, and .png, for logos and banners.
If you need more storage space, you may upgrade your account to the unlimited plan. Please refer to https://www.podbean.com/podcast-hosting-pricing