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I have had success with a windows 10 PC and the Telstra Smart Modem Gen 1.1 which has a similar GUI to the Telstra Gateway Max 2. See section 30 of document attached to this post for instructions.
You might also have to enable SMB1.0 by
Clicking on Start Start typing Turn Windows Features On or Off When “Turn Windows Features On or Off” appears in list of suggestion click on it. Scroll down to “SMB 1.0 file sharing support” and place a tick in the box.