Welcome to the AmpJuke forum and thanks for posting.
First and foremost, before
uploading anything, you have to make sure that you have your music stored in the 'right' place, and that AmpJuke is aware of that.
It's normally done during installation or later by logging in as a user with admin rights and selecting "Configuration..." in the low left corner on the 'welcome' screen.
Look for the section named: Location of program files & your music
, and be aware of the fact that your music should be on the same computer
as you installed AmpJuke on.
The field for "Base" directory where your music files are located
is - as indicated - where you're supposed to key in where your music is located.
Important note: It's an absolute path
After setting the right value for "Base" directory... click "Save & continue", then on the next screen click "Scan & import all music available".
AmpJuke will complain if there's something wrong, - f.ex. missing permissions
In case you missed it, there's also a detailed installation example available
Once you have the right stuff in your "Base" directory... configured, you can take a look at what's possible in relation to upload
as well as download
Hope some of this helps.
If not, please update the thread (well...feel free to do so anyway).