Struggling to find info on universal URL/link for DT md (ie dropbox,icloud), would love to get tips!

Hi all

I have seen this post

which inspired me to try this system which would hopefully allow me to deal with images across all my md files and hopefully also in DTTG.

my only issue is how does one create universal URLs to one remote, easy to access folder/image from any device platform.

I though of putting all my images in dropbox to iCloud but cant find a way to create universal links to individual files. I know its east on a Mac but what happens on iOS or on other devices?

any tips would be great

thx so much in advance!!