I am trying to change or upload a user profile while signup or profile update in azure active directory b2c using custom policy. I found a "thumbnailPhoto" property having datatype Edm.Stream by using this I am trying to create a custom ClaimType like this. but it's not working please help in changing user profile through custom policy
<ClaimType Id="thumbnailPhoto">
<DisplayName>ProfilePicture</DisplayName>
<DataType>stream</DataType>
<UserHelpText>Upload profile picture</UserHelpText>
</ClaimType>

