Upload option and other capabilities disappeared

The link above will not presently work without being logged in. The issue only shows up on the back end.

When trying to upload a sermon, the ability to add notes (not the extract) and the audio file upload itself, is missing. The console shows:

mappress_media.min.js:1 Uncaught TypeError: Cannot read property ‘toLowerCase’ of undefined
at mapp.Media.renderList (mappress_media.min.js:1)
at Object.callback (mappress_media.min.js:1)
at Object.success (mappress.min.js:1)
at i (load-scripts.php?c=1…ery,utils&ver=5.5:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=1…ery,utils&ver=5.5:2)
at x (load-scripts.php?c=1…ery,utils&ver=5.5:4)
at XMLHttpRequest.c (load-scripts.php?c=1…ery,utils&ver=5.5:4)
renderList @ mappress_media.min.js:1
callback @ mappress_media.min.js:1
success @ mappress.min.js:1
i @ load-scripts.php?c=1…ery,utils&ver=5.5:2
fireWith @ load-scripts.php?c=1…ery,utils&ver=5.5:2
x @ load-scripts.php?c=1…ery,utils&ver=5.5:4
c @ load-scripts.php?c=1…ery,utils&ver=5.5:4
XMLHttpRequest.send (async)
(anonymous) @ VM171:1
send @ load-scripts.php?c=1…ery,utils&ver=5.5:4
ajax @ load-scripts.php?c=1…ery,utils&ver=5.5:4
ajax @ mappress.min.js:1
find @ mappress_media.min.js:1
initialize @ mappress_media.min.js:1
mapp.Media @ mappress_media.min.js:1
(anonymous) @ mappress.min.js:1

Thank you for your help.

The page I need help with: [log in to see the link]