Step 2: Disconnect your Android WhatsApp app from Google Drive backup
a). Open http://drive.google.com on your web browser and sign in using the email address and password you’re using on the Play Store of your Android device. Now, click “My Drive”->”Settings”-> “Managing Apps”.
b). Select WhatsApp Messenger from the list, click on “Options” and then click “Disconnect from Drive”.
Step 3: Open WhatsApp on your Android and backup your chat conversations
Next, you will need to backup your WhatsApp conversations so you can transfer them to your iPhone later. Open WhatsApp on your Android, go to Menu Button > Settings > Chats and tap the “Back Up” button.