Well, you moved the goalposts by using the FilePicker, which returns a contenturi instead of a file path.
A quick fix is to use this extension:
which should convert your contenturi to a file path.
@Joejsanz - could you have a look at what your extension actually does? Seems it does not handle the more obtuse contenturis, only the ones that actually contain a file path of sorts.
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If you put the GetAbsolutePath FromUri function directly and discard the MakeFullPath function, does it also give an error?
I did these tests, the other methods will give you uri, you have to put the GetAbsolutePathFromUri extension directly to give you the path.
You might try the Filetools extension which has a contenturi convertor:
Although the download link is currently dead ? @vknow360
or there is this extension which should solve everything...
That's right, something is wrong, after compiling the APK I get the error. I will review that code in the next few days.
Thanks....fixed 
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Another solution: use the SAF extension (credits @vknow360), copy the picked file to a folder in your ASD, then get the filepath for that and POST it to your server.
(You can set the filetypes and initial directory to your liking)
You could also delete the file from your ASD folder, after uploading, if no longer needed.
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The document is an html page which is located in my download folder
I just saw your last message i m gonna try
So I recreate exactly what you did but when I choose the file nothing happed at all. Like the first bloc is working perfectly for choosing the file but then nothing.
html/* should be text/html
What do you see in Label2 ?
Is a file created in PickedFiles ?
Set another label to capture the uriString
Wait I didn't saw that message at first I'm trying right now and it's seems to work but the server don't respond let me checked
Not quite 
You should also be using Web1.GotText NOT Web1.GotFile...
ok so there is the news
I tried the extension you send me and the path that I got look perfect BUT when I tried to read the file froim the path to verify it tells me that:
As expected, the JewelFilePicker stores a copy of the file in the private area of your app (companion) this is not (as in your case)/may not be accessible to other components.
Ok so apparently it can read the file by using the URI instead of the PATH.
So now I can read the file but when I tried to send it no response.
I'm trying to bluid the apk it keep disconnecting
Please try my SAF example with the corrections I suggested.