Decide what the memo is
There are two different jobs here. If the memo is a sketch, it tells the producer the melody, the words and the feel, and you sing it again once the song has taken shape. If the performance itself is what you want to keep, the song has to be built around that exact take, with its timing and imperfections.
Say which one you want before anything else happens. A new vocal over a finished backing will usually sound better, but some memos carry a feeling you cannot repeat. Both are reasonable choices and you can try one, then the other. Keep the original memo in the project either way.
Get the file in and hear what you have
Share the memo from your phone and upload it as it is. M4A, MP3, WAV, FLAC, AIFF and OGG files all work, so there is nothing to convert first.
Phone memos usually carry room sound, handling noise and a tempo that drifts. Cleanup can reduce steady noise, but it cannot restore detail that was never recorded, so start with the best take you have. Ask the producer to listen and map the song first: where the sections fall, the likely key and tempo, and where it is unsure.
Build the song in passes
Give the arrangement one clear direction, such as a stripped acoustic verse that opens into a full band chorus. Leave space for the voice: an instrument playing through every word makes a memo sound smaller, not bigger. Generating music around your recording sends it to a third-party music service, and Dhun asks for your permission each time.
Then finish in order: structure, timing, balance, master. Check each version against the memo and ask whether the song still has what made you keep the recording. When it does, export the whole track and play it wherever you first heard the idea.
Common questions
Is a phone recording good enough?
For an idea, yes. For a final vocal it depends on the room and how close you were to the microphone. If the song works but the recording holds it back, sing it again over the finished backing and keep the memo as a reference.
My memo has no steady beat. Can it still become a song?
Yes, but it is a musical choice. You can build a regular backing and sing to it again, or keep the free timing with a sparse arrangement that follows the voice. Tell the producer which you prefer.