Or just (in Windows), Select all, Rename the first in sequence and it will rename all of the rest for you – you can even start them from a number, eg rename the first ‘Walk (23)’ and it will start from 23 to your final frame. This worked well for me to link to separate AP exports together and then render to one file – So it removes the ‘hold’ name, keeps the sequence and lets you join scenes up – Easier than it sounds honest 🙂