Hi madhura178,
Welcome to the Apple Community.
Seems Voice memos isn't set up to import files ?
But you may want to preview and import audio files into GarageBand: ( eg: from the Files app.)
(or you might save audio files into iMovie.)
Would that help ?
GarageBand for iOS
https://www.apple.com/au/ios/garageband/
iMovie for iOS
https://www.apple.com/imovie/
Import audio and MIDI files into GarageBand for iPhone
You might want to scroll to:"Import audio files with the Files app":
https://support.apple.com/en-au/guide/garageband-iphone/chsab9d208e/2.3.9/ios/14.0
View files and folders in Files on iPhone : (ie: find recordings to import)
https://support.apple.com/en-au/guide/iphone/iphc61044c11/ios
Sorry I'm no expert in this area.
Hope this helps :)