Load kml files in Google Maps for mobile

I have finally studied track navigation, but it should be noted that my track navigation is not a general professional concept of navigation, I just figured out my own idea of how to navigate the track to prevent lost in the wild.
This problem is not serious, and it seems easy to solve. However, my mobile phone is a smartphone, which is complicated because many navigation software does not support smartphone, the rest do not support trajectory navigation.
However, when I went out to climb the mountain, I hoped to download the trajectory files provided by other users on the road as a reference. This problem seems very easy, however, I haven't found any software that can implement this function and run on the SP for a long time.
When I went out for a mountain yesterday, I encountered the same problem. So when I came back, I carefully studied Google Maps for mobile. As a result, I was pleasantly surprised to find that this software actually supports reading kml files, this means that I can convert the GPX track file downloaded from the Internet to kml, load it to Google Maps for mobile, and add GMM to read the GPS track, you can basically implement trajectory navigation.
Imagine I turned on the Bluetooth feature of my M-241 (on the hill I found my GMM crashed as soon as it was connected to GPS, depressing me for a long time, later I remembered that I just turned on the M-241 Bluetooth, actually the mobile phone Bluetooth did not open, it is too dizzy ), then, connect the bluetooth device through the mobile phone to display the current track point on the GMM, and then load the downloaded track to the GMM through kml, which basically achieves the perfect track navigation, in this way, you can take a reference when you get lost, avoiding the waste and enhancing the travel security.
GMM's support for kml is rarely mentioned on the Internet. Article As follows:
Today, an article published an official Google announcement on Google Maps for mobile: Now you can view the kml file of Google Earth in GMM!
The kml file is a geographical data tag file used by Google Earth (and Google Maps). It contains vertices, images, and polygon and can be viewed as a mashup component of Google Earth, now you can use your mobile phone to view the online kml files.
To try this function, follow these steps:

1. Enable GMM
2. Select "Search"
3. Enter a kml or kmz URL path in the search box, such as "http://step1.appspot.com/Route.kmz" (I do not guarantee that this sample file will always exist, Step1 webmaster note)
4. Then we can see the track and mark in GMM (the above example only contains one track without marking)

it is cool to view each tag in GMM. You can simply switch between tags by pressing the number key. This effect is exactly the same as switching between tags in search results.
I will add that the kml format does not support all kml labels. GMM only supports the following types:
1. placemarks tag containing the element
2. points
3. icons
4. folders
5. HTML content in the element
6. kmz format (compressed kml file, including image attachments)
7. linestring and polygons, used to describe the line
8. line and polygon styles, including color, fill color, and transparency
if I had seen it before, I would have certainly felt quite a little supported, but now I am no longer in the Map Industry, from the user's point of view, I think these can already meet my requirements.
I found that the kml path can only be specified through the URL in the search box. It is a pity that the local access is not supported. I am going to continue searching for it online, check whether the local kml file can be opened.