This may be a really stupid question to experienced UE users, but how do I import .uexp and .ubulk files into UE4? I’ve searched all over the internet to see if this is possible but I get no results that help me. I have attempted to open the two file formats in UE Viewer, though the program seemingly doesn’t even register their existence when I put them in the directory file. Is there a solution to this? I’m very new to UE and I know basically nothing about how it all works.
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Update: I’ve figured it out myself. I found out you need to open a .pak file containing the .uexp and .ubulk files in UE Viewer and then export them out in a format that CAN be imported into UE4, Like for example, glTF 2.0 (For 3D Models) and PNG (For Textures). If the .pak’s contents don’t turn up in UE Viewer, make sure you tick the box that says Flat view. I hope that helps anyone out there who has this problem. 
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Files imported into editor are stored as uasset then when you build an application the editor will “cook” those assets to optimize them for your application in uexp ubluk. They will be stripped down of some editor only data and optimized for runtime use.
You can load those assets directly in your runtime application.
You can also load them in your editor if needed: Working with Cooked Content in the Editor | Unreal Engine 4.27 Documentation
However your question means you need to look a bit more into your process.
Why do you want to open cooked asset in your editor? Cooked asset are not a good interchange file format.
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The reason I wanted to open up these kind of files was because they were what came out when I extracted a .pak file that was part of a mod I downloaded. Don’t worry though, I’ve figured out how to properly extract models and textures from a .pak using “UModel”.
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“ue viewer” being ?
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