Randomly changes how you edit videos, can’t edit individual videos one at a time, only total uoax

Been uploading workout vids on TikTok, every other day this week the editing changes. Other day couldn’t edit when sound starts, today can’t edit individual videos. Anyone know what’s going on? I really don’t want to have to pay for a separate app to edit videos I upload as a hobby, hate that they change this, it was working just perfect last week.