The album (photos/videos), microphone, camera, or notifications access for the Teachme Biz app may not be allowed in your device's OS settings.
Please configure access permissions for "Teachme Biz" in your smartphone or tablet's settings app.
Related: What should I do if some or all of the photos saved on my device are not displayed as options when registering images to the mobile app?
https://help.teachme.jp/hc/en-us/articles/11188734425625