Hi i have the same problem, I use singularity i can not upload textures for free (temporary) and i got this message "unable to upload asset" i tried the 10L option on the same texture and it worked.
I tried with sl viewer but the free option is not even there lol
Someone tried an older version of exodus and seemed to have been able to upload a texture for free. I think Lindens need to look into this, unless free upload is going to disapear? i hope not!
Any solutions are welcome please
Thanks