Webview with iframe are not working

[juliengit2]

The webview cannot load the content of an iframe (webview display blank), and I get the following error :

The operation couldn’t be completed. (FBSOpenApplicationErrorDomain error 1.)

I try many things, including added in the Info.plist :

 <key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
        <key>NSAllowsArbitraryLoadsForMedia</key>
        <true/>
        <key>NSAllowsArbitraryLoadsInWebContent</key>
        <true/>
        <key>NSExceptionAllowsInsecureHTTPLoads</key>
        <true/>
        <key>NSThirdPartyExceptionAllowsInsecureHTTPLoads</key>
        <true/>
        <key>NSTemporaryExceptionRequiresForwardSecrecy</key>
        <false/>
    </dict>

it works with a simulator but not with a release build on a real device... and it's very annoying... :((

other info :

the file I'm trying to load is a local html.

The file exist (I can read it), but I cannot use LoadFile (and initialFile) because files are not known in advance and consequently cannot add them in pubspec.yaml (required by this method, otherwise files cannot be found).

I tried also Loadurl (with initialUrl) and calling file:https:/// but it works only on android and on ios simulator, but not on ios with a real device (logs show the error above). and it's really really annoying... :(((

Any idea?