Many taking part in drama hate singing - and some can't sing very well! Actually, this is not a big issue for a dramatic actor - but using the voice is an important technique.
Like dance, singing can make a prospective drama actor want to run away - I understand that I was the same.
The truth is in many films and shows the actor mimes the singing anyway - so the important thing if not a natural singer is to have the timing and posture right and let the singer sing to your excellent mime!
This is why I still use lip sync as a technique - it gives the actor the ability to synchronize with the soundtrack, be it singing or script - as sounds from location shooting if often recorded in the studio and dubbed into the film after.
The video at the bottom of the page shows James D in early rehearsal for "InvisAble Me" where he not only had to sync to several 60's music tracks - but also learn how to be out of sync too. [James is a natural for lipsync] Sadly lockdown stopped filming so we never got this work completed.
Narration and voiceovers also form part of drama work.
Actors may also need to learn accents for a role so voice practice is important.
I admit I am no vocal coach - but actors will normally have a voice coach if working in the industry and those doing it for fun - have fun trying!!
The results can be great.