This is the most reliable way to create a DNG preset for mobile use.
After running any tool, open the DNG in Adobe Bridge or Lightroom. Edits (exposure, crop, etc.) should appear without a separate XMP file present. xmp to dng converter free
XMP is a file format used to store metadata, such as camera settings, keywords, and copyright information, for digital images. It's commonly used by Adobe Camera Raw and Lightroom. On the other hand, DNG (Digital Negative) is a raw image file format developed by Adobe, which stores raw data from the camera's sensor. This is the most reliable way to create