See Bonjour Simplified and the “DEVONthink for IOS Manual”, along with the “DEVONthink Manual” for full instructions. Also in Help. DEVONtechnologies | Handbooks and Extras
Hard for me or others to sort through all your screen shots. But if you review the above, and start at the beginning, Looks like with your last screen shot “KEC@kenricks-mac-pro” is your Mac? So click through.
You ask if Bonjour or Apple’s services is better. Bonjour works well. Apple’s stuff–not so well, as you are noticing. Setup Bonjour, then work on Apple. Might make it work. You can have both active.