EDIT
Like suggested in the answers, i submitted this behavior to visual studio, and as a solution, i removed those special characters in the files name.
Visual Studio Team Services (was TFS Online) generated a build of the new version of my the solution, no problems in that. But i noticed that some files that i uploaded that have some special characters (ã,ç,õ), were generated with other characters, like "ç" changed to +º+.
We can't upload files with those characters? Or is some configuration that i am missing in the build configurations or elsewhere? Or some files with wrong encoding ? I uploaded .mp4 files and those special characters were changed as well.
Searched for this particular problem and only found problems with file name too long.
Looks like a bug. You probably need to submit it on the UserVoice site:
https://visualstudio.uservoice.com/forums/121579-visual-studio-2015