“…Stupid Sequoia bug”
I agree
Will do Jim, thanks!
OK, I uninstalled, restarted, reinstalled Omni Outliner, ran terminal qlmanage -m plugins, same exact list as before - this EVEN if Omni flashed a postinstall message saying that plugins were installed. But I think it mentioned Spotlight only. So could be Apple vs Omni (not having an updated QL plugin)
You only mention .oo3 files; is there any difference in behaviour with .ooutline files? The older .oo3 file format has been deprecated for some years now, and while my .oo3 files preview fine under Catalina, very few (though not none) of them do under Sequoia. I think it may just be bundled .oo3 files that no longer preview, and flat ones that still do; at any rate it’s worth converting a bundled one to a flat file and seeing if that makes a difference.
Thanks Nick, I tried both oo3 and outline - none is previewed.
Now that you point it out, .ooutline files aren’t previewing for me under Sequoia either; the Best Alternative view displays a document thumbnail instead of the collapsible outline I get under Catalina, and even .oo3 files where I do get a full-document view are no longer collapsible.
After searching around a bit, it seems there are several apps having problems.
From macOS Sequoia 15 Release Notes:
Support for deprecated Quick Look Generator plugins is being removed. To provide previews and thumbnails for your custom file types, migrate to Quick Look Preview Extension and Thumbnail Extension API. (116791365)
So Omni might have to update some things. They are just usually on top of new OS releases. And since they have a thumbnail extension listed in System Settings, that would suggest this change shouldn’t affect them? But this is my best guess.
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MindNode is a workable two-pane outliner. In either outline or mind map view you can fold topics and drag them around. Quick look previews are working for me, although the preview always seems to be a mind map view, not an outline view.
There’s a handy link between MindNode and Markdown.
You can export a MindNode file as Markdown, creating a Markdown document with nodes as appropriate level # headings.
If you open a Markdown file with MindNode, the # headings get used as node titles. The rest of the text is applied as notes related to the headings they appear under.
So, you could start with a MindNode mind map, shotgunning out ideas.
Then, switch to outline view and drag your nodes around in MindNode to match a narrative.
For a Scrivener-esque experience, hide the notes in the outline (settings button at the bottom) and open the Note Inspector.
Export to Markdown to save your work as Markdown, including your drag and drop restructuring. You can’t just save it, because that will save your work as a MindNode file, not the Markdown you’re expecting. Nothing is lost, it’s just in MindNode format. You can still export it as Markdown later, too.
On a compassionate note, don’t make DT staff endure any more stress from users than they must. If you’re going to maintain a Devonthink Markdown file in MindNode via opening and exporting, please do so in an indexed location. 
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oh bummer… but thanks for letting me know. And, yeah, Omni Graffle files are not previewing either.
That they are. But in Sequoia I don’t see their thumbnail extension listed.
I hear ya Amontillado! Heaven knows Jim has been patient with me. I will investigate MindNode - tx! I do have iThougthsX, which if I’m not mistaken could also do outlines, but I think it’s more of a shoebox, so I will try and report back here.
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iThoughtsX can’t be previewed (generic icon), but MindNode can - unfortunately the preview is static (am I being too greedy? I remember the foldability of OO outlines…)
For more powerful MindNode stuff I would have to pay for the Plus option, but not too sure if it would be that helpful.
I really really wanted something as simple as what Apple Notes just did.
Bike is a great outliner that previews with DT via quicklook. I used to use OO but I find this simpler and easier most of the time.
However I would add that my install of DT has a bug where it wont preview properly and it’s never been resolved. However everyone else that’s tried installing it has had no issues. So perhaps worth a punt.
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Ironically Sequoia ships with lots of .qlgenerator plugins, see e.g. folder /System/Library/QuickLook.
I’m still on Ventura and see no reason to upgrade, so I can’t check for my myself, but I don’t doubt it. Of course there are different rules for apple itself and third party developers… 
Thanks Plinth - Bike is almost there for me. It does preview cleanly, the thing I am missing is the ability to fold/unfold in the preview itself as the old Omni Outliner used to do.
The reason I am looking for this, is, I don’t mind editing in the app (Bike in this case), but I would like to have a compact preview in DT, and be able to browse the sections, folding/unfolding as I go. For lists of things where I have maybe 20-30 headers with stuff under each.
Ah - interesting, thanks - I will check!
Ah yes, I already saw that, tons of Microsoft, Apple and some openxml.
Thanks Plinth - Bike is almost there for me. It does preview cleanly, the thing I am missing is the ability to fold/unfold in the preview itself as the old Omni Outliner used to do.
Mine seems to do this ok.
Ah yes - I mean in the preview in DEVONthink itself