To upload and manage media-files (like pictures, audio, mp3, doc...) click on "Media Manager" on the right upper corner or in the dropdown menu if using small device. (see screenshot 1)
Here one has many possibilities (according to ones permissions which can be changed upon request) to upload, add infos, delete... On the left side one can chose he target namespace. (see screenshot 2)
Once open the upload one can select serial files up to 64 MB at one time. After that simply bush upload and it would progress to place a copy into the selected folder. (see screenshot 3)
By clicking the item in the list one gets the file details. The underlined link is the relative link to be used on ati.eu or here within the ati-bbc-codes. (see screenshot 3)
More and detail infos about mediafiles and how to handle can be found at:
https://www.dokuwiki.org/media_managerNote that the filename must be according to the standards (small letters, no special characters...) and a permitted file type.