Invalid Timestamp Error

Hello,

I'm trying to use the advanced renamer to change the name of a several image and video files to the date (year, month, date, hour, minute, second) that the pic/video was taken. I'd also like to add 6 hours to the time as I was abroad so the timestamp is 6 hours off.

I have uploaded the images and videos to Renamer but when I try to use the timestamp tool I'm getting an "invalid timestamp" error message. Through digging in the forums I found another method "New Name Method" where I could do this <Img Year>-<Img Month>-<Img Day> <Img Hour>-<Img Min>-<Img Sec> and that actually worked but only for the pictures and for the videos it says "Multiple timestamps" or something like that. Also - I'm not able to add the 6 hours using that method.

Can anyone tell me what's going on as in the EXIF data it appears that the timestamp is there and valid? Not sure why the error.

Thank you so much!!