In ASSET.blend, which is in the asset folder. Added many objects:
.
But after saving and opening new Blender file, only some of assets appear here:
There is same problem https://blender.stackexchange.com/questions/277259/new-assets-wont-appear, but I think, there is no solution. 
Try to save the blend file that has your assets in your Library in the Asset Library Folder
Preferences → File Paths → Asset Libraries.
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Think I’ve figured it out:
- First of all, go to your Blender floder and create there a folder called ‘Assets’,
- Copy & paste your .blend file, in which you want to save your assets, into that ‘Assets’ folder you’ve just created,
- Open your Blender and go to Preferences → File Paths → Asset Libraries,
- In Asset Libraries section, click on ‘+’, then click on folder icon and choose the path to your ‘Assets’ folder you’ve just created from step ‘1’. Don’t forget also to give a name to your Asset Library, otherwise you won’t be able to save it,
- Now, open your .blend file exactly from that ‘Assets’ folder where you’ve put it.,
- In an ‘Asset Browser’ (see spoiler below), choose your folder from the drop-down menu, in my case I’ve called in ‘MAIN LIBRARY’, you can call it whatever you want (see step 4),
Summary
- Now just choose your objects in an outliner window in the top right corner, RMB and click ‘Mark as Asset’,
- When you’re done, File → Save and open another .blend project to where you want to put your assets from that one.
- Repeat the step ‘6’,
- Now it should works. Just drag & drop objects to your scene.
Hope it helps,
Cheers
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It worked, thanks so much! 
God blessings to You! 
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Thanks, Pedro!
May God blessing you too!
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