Data not submitting in custom field

I’m trying to create a custom field for event speakers. The field will accept a speaker’s name, company and position, a short biography, and a photograph. This is the code that I have at the moment:

https://pastebin.com/pzVWNqF5

There are two issues that I am facing here:

1) Data for the photo, the name, and the company are not saving, but the biography field is.
2) The option to hide the URL textbox on the image/file field is not being accepted.

This happens regardless of whether the field is in a group, whether it is on its own, or whether it is on an options page; the same things happen regardless of where I call the field. Any other field that I have created in this style has accepted the data and saved it as normal. This is the only field that doesn’t seem to save.

Is there something that I’ve missed? I’m going to try with another field (one for a schedule item) but this seems to be a little strange that it isn’t accepted. Any advice?