If you encounter difficulties using the PASTE function on your Android device, the easiest way to solve this is to install a keyboard with the Paste function already built into the keyboard.
There are many keyboards Apps available in Google Play. Below is an example using Gboard.
COPY the text that you wish to paste
Open and proceed as usual. Once you are ready to PASTE, below are the step-by-step screenshots.
Note that there might be some variations between different device models.