Save leads to Warnings that files cannot be used

Hi,

My Problem:
Texture-Files cannot be used, cause UE4 thinks there is an “/” within the Name and therefore it search for a directory which dosn’t exist.
It also unlinks all Materials from my Meshes and all Textures from my Materials, after restarting UE4.
It is really frustrating to link all Textures to the Material and the Material to the Mesh over and over again.

What have I done:

  1. After Linking all Textures (Roughness, Metallic, Base-Color etc.) to the Material I added the Material to a Mesh.
  2. I placed the Mesh within the Map
  3. I clicked on “Save All” (Warning occours)

I can ensure, that they are no files which contains an “/”.
please view the attached Files: