Management Center (MGMT CTR) after 1.7.x has a Files sub menu to host Files like a web server.
Default is https scheme URL
By default, MGMT CTR has no way to validate Certificates. Please enable Port 80 for pulling the file for devices like Reporter and itself.
To upgrade MGMT CTR using its own File Hosting option, it can be done following the WebGuide here:
The thing that the documentation does not state is:
# security http enable
# http-proxy disable
# installed-systems add <http://IP:8080/path>
# installed-systems view
# installed-systems default <index_number>
# restart reboot
# http-proxy enable
# security http disable