Are you using the HDR file for special effects lighting?
Or, are you merging the files into a single JPEG with something like lightroom?
There are two possibilities:
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you can take brackets and then download the brackets to your mobile phone automatically and then create the HDR with something like lightroom
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you can merge the files inside the camera into a single hdri file
there are many applications to take brackets.
Please provide more information on your use case.
this is the webapi
This is the info on creating apps inside the camera.