Have a look at a bridge for UV editing within two programs.

Have a look at a bridge for UV editing within two programs: 3DSMax and RizomUV. You can get a free version or a paid one with more features.

How it works

In 3DS Max:

• Select object or multiple objects
• Select editing mode
• Press button with the RizomUV logo

In RizomUV:

• Create or edit UVs
• Press Save

After saving in RizomUV, 3DSMax window will reappear and UVs will be assigned like modifiers on object or objects.

How to edit a preset file:

• In RizomUV open Script and Command log window (default shortcut is “L”)
• Select necessary lines and copy/paste them into the preset file

The script works in 3DS Max 2016/2017/2018 (may work with 3DS Max 2019). You can find the script here and there (extended version).