how do I overcome this problem?

Hello, there. Sorry for any inconvenience caused.
Could you please delete the original app from your mobile device first and install the latest version from our official website https://dji.com/downloads/djiapp/dji-fly. It is recommended to install it from the file manager.
And if this operation doesn't work, may I know your system version, and can you provide relevant videos or screenshots?
Thank you in advance.