Update README.md

README.md

@@ -58,9 +58,9 @@ Google Photos _will_ actually show it too, but only when it is stored in local p
 
 The reason is probably directly related to Motion Photos -  the same place where Motion Photos are defined (in XMP object GCamera - `http://ns.google.com/photos/1.0/camera/`) is also the place where Google/Android stores JPEG/R HDR information.
 
-It appears that the server-side processing of Google Photos does not check for Apple HDR once it finds Google Camera header in XMP tags. The two formats appear to be significantly different, thus an easy conversion is not possible. See [Issue #2](https://github.com/PetrVys/MotionPhoto2/issues/2) for more details.
+It appears that the server-side processing of Google Photos does not check for Apple HDR once it finds Google Camera header in XMP tags. For JPG files, a conversion is possible by adjusting metadata and is on the roadmap. Unfortunately there is no support for Gainmap HDR HEIF images in libultrahdr or any modern Android devices at the moment.
 
-Hopefully, as Gainmap HDR matures, both Google and Apple will converge on ISO/CD 21496-1 and things will just start working. On Apple side this has happened already - as of iOS18 RC on iPhone 15(pro), iOS stores HDR in ISO "tmap" format. Unfortunately iPhones 12-14 are stuck with Apple Gainmaps. On Google side keep an eye on [libultrahdr](https://github.com/google/libultrahdr) used in Android and also most likely in GPhotos backend. It currently only supports JPEG/R, but HEIC support [is on the way](https://github.com/google/libultrahdr/issues/195).
+Hopefully, as Gainmap HDR matures, both Google and Apple will converge on ISO/CD 21496-1 and things will just start working. On Apple side this has happened already - as of iOS18 RC on iPhone 15(pro), iOS stores HDR in ISO "urn:iso:std:iso:ts:21496:-1" format for both JPG and HEIF. Unfortunately iPhones 12-14 are stuck with Apple Gainmaps (for JPGs, it should be possible to remux them to ISO format, though). On Google side keep an eye on [libultrahdr](https://github.com/google/libultrahdr) used in Android and also most likely in GPhotos backend. It currently only supports JPEG/R, but HEIC support [is on the way](https://github.com/google/libultrahdr/issues/195).
 
 ## Credits
 
@@ -77,4 +77,4 @@ Google official documentation of the format
 Samsung trailer tags are well explained in doodspav's repo
 - https://github.com/doodspav/motionphoto
 
-HEIC muxing is similar to doodspav's work, but additionally uses MP4 top-level boxes "mpvd" and "sefd" to add the MP data into heic and mp4 in standard-compliant way (see source in this repo).
+HEIC muxing is similar to doodspav's work, but additionally uses MP4 top-level boxes "mpvd" and "sefd" to add the MP data into heic and mp4 in standard-compliant way (see source in this repo).