hi guys
i have 22 textures to apply randomly in a floor made buy single objects instance ,but I see corona multi texture map only acept 15…
help 
Try latest build. Number of slots was expanded up to 99 or so.
last version of corona ?
You’ll need install daily build. Or if you don’t feel comfortable with that, you’ll have to wait for stable v1.2 which probably will be available in a week or so.
As backup plan you might use multitexture plugin + texture by element modifier.