Image From Server Corrupted / Base64 to Texture 2D / Mobile

Dear community i need your help :).

I have an issue when i send the image from ue4 4.21 windows client to server as Base64 and i download it again as Base64 to texture 2D for android ASTC build client, the image is corrupted
(only on android on windows it’s ok).

1_is this has to do with the texture format;
2_the texture settings is stock and without mip maps.

Thank you i will appreciate any help.