C:Ed
As the name suggests, Multiview is just a viewer. Ed is a text editor built into every version of Workbench.
The docs are next to useless - they pre-date your type of setup and have nothing referring to SD cards, but they do give examples of the type of file you'll need to create. Will try to copy an example from my setup later.
Aha ok... Didn't know that. You see I usually use Multiview for everything, and never had any need for editing...
And yes, I started to slowly realize that the docs doesn't match my setup. Hence the big confusion earlier when you guys say one thing here, and the docs says something completely different!
Quick thought: you did enable LUN's on the controller, yes?
Yes LUN's are enabled. In fact I have the jumper hooked up to a wire, leading to a switch on the back for easy access. Sense we all know the card is very slow, having the option to easy switching it off when booting from a gotek or floppy is a really neat feature!
Third thought - I had no problem opening the .lha archive on my PC with WinRAR and then opening the "Readme.too" file in MS Word. If you rename the extension from ".too" it'll open automatically, or just select Word from the list of "What program would you like to open this file with?" that Windows pops up. 
I've just tried that, and it worked great!
So I have printed it out now. I always in troublesome cases like this prefer to have physical documents at hand. So much better in my opinion
At least the setup examples might be useful...
Okay, 4th post in a row now from me and I'll STFU. Make sure your card is properly formatted (I would format and test it on a PC, just to make sure). Start with a small card to make it faster.
Next you'll want to put "FAT95" in your SYS:L directory. I'm using version 3.18, which I think is the latest.
Configure yourself a DOSDriver in SYS: Devs/DOSDrivers/ like my screenshot attached. Note that as a previous post said, you'll need to modify the unit number for your specific device, although you can always try mine (assuming you have the same model of card reader I do), and the device name.
Don't forget the tooltypes in your icon info file (see second screenshot, attached). Although it may be redundant, it probably can't hurt.
Make sure your SD card is inserted, reboot, and see what happens. I know it works because I used my card right now to transfer the attached screenshots from my Amiga to my PC to post this. I suppose if I was really a glutton I could've posted it directly from my Amiga, haha.
And once again thank you so much for taking your time helping me with this. And as usual I will try things out as soon as I can, and come back later to report
And a little side thought.... You really should sometime in the future when you have the time for it make a Youtube video about this. I've always liked your Amiga related videos. Especially the one on how to install 3.9
Witch I used for setting up my 1200, a bit slow perhaps with the expansion I'm currently using. But at least it worked
