Why is Expo app so big?

The size for an app built with expo build on iOS is approximately 20mb (download), and Android is about 15mb. This is because a bunch of APIs are included regardless of whether or not you are using them — this lets you publish updates that use new APIs, but comes at the cost of binary size.

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How do I create an OBB file?

Set the input directory for creating an OBB file, or the output directory when extracting ( -dump ) an existing file . When creating an OBB file, the contents of the specified directory and all its sub-directories are included in the OBB file system. Specify the filename for the OBB file.

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