Is there a way to import and export the 3DMAX Arnold scene and the Maya Arnold scene?
Vray can
Correct me if i'm wrong but i don't think so?
Afaik Arnold Scene Source files can't be imported back to Max or Maya and
Universal Scene Description Plugins for Max and Maya are on the way but there is no ETA yet.
If you are capable and willing to build the plugins yourself you can check out the github page
https://github.com/Autodesk/arnold-usd
https://github.com/Autodesk/maya-usd
Otherwhise try FBX
Afaik Send to only works if you have the same Version of Max and Maya. Do you have matching versions installed? Or did they remove it completely?
Regardless, doesn't Send to basically just exports the whole scene as FBX?
Shouldnt make a difference