I have no operator preset options (FBX 6.1 ASCII, FBX 7.4 Binary). I had blender 2,79 now 2.80 but no presets appear. That makes it impossible for me to export FBX with textures. I read somewhere that some file needs to be modify somewhere on the computer but it wasn't clear. Any ideas??
The .fbx ASCII format has been removed in Blender 2.8, the remaining export format is the binary format. You should be able to export to the other application just as you did in Blender 2.79, except that in the older version you had to explicitly select the binary format which is now the default in 2.8. The materials need to be setup separately because .fbx can't store Cycles or Eevee materials.
In order to embed texture into the file you have to set the following two options:
- Path Mode is Copy
- Embed Textures is enabled
Although I haven't personally tested it, you may want to try glTF as export format because it should be able to translate textures and materials to the other software, if you use the principled shader for a PBR setup.