Yes, you are allowed to upload covers and remixes to your Discography, as long as you own the appropriate rights. Because your covers and remixes are based on the original artist’s track, you will require the right holder’s permission to upload and publish your cover or remix on Show4me.
Reminder: please keep in mind that the creator of the original track may not necessarily retain all of the appropriate rights, especially if the music has been licensed to a recording company. Meaning that getting their permission alone may not be sufficient enough. Hence we would advise you to be extra careful and make sure that you have all the relevant permissions from the correct rights holders prior to uploading your cover or remix.