I imported notes from Joplin to Obsidian recently, and I had the same issue. Nothing to do with Evernote, per se (I never used Evernote).
I didn’t document every single step I took to fix the issue, but it should be pretty simple.
If I remember rightly, I think the “_resources” folder is inside the Joplin folder that you are moving to your Obsidian vault folder, and I think you just need to move it up one level, to the root of your vault.
In other words, you just need to make sure the directory structure pointed to in the Markdown text is actually pointing to the folder you want it to point to.
I don’t know the syntax off the top of my head for what one dot or two dots or three dots in the address (the “…/” at the beginning of your directory address for each image) means, but I believe two dots means “go up one level” and one dot means “start on the same level.” Three dots is a new one to me.
Either look it up or just experiment with one particular address in one of your imported Markdown notes…you’ll get it figured out. It wasn’t that difficult to fix.
Alternatively to actually moving the “_resources” folder, you can use Notepad++ to search through all the notes in a particular folder and replace the bad address with whatever the right address should be. Use Ctrl-H and there’s a tick-box to replace in all files in a directory.