Hello
Thank you for your question and reaching out.
If there is a domain trust, you can think about using groups nesting to gain access to shared folders.
In the domain where your users are situated, you might set up a Global Group, and in the domain where you want to use it, a Domain Local Group. For file/folder permissions, use the Domain Local group. Then make a member of the Domain Local group out of the Global Group you formed in the user's domain. Remember to restart the computer or log off and on again after adding the users to the Global Group so that the new access is given to them.
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