I would duplicate a copy of your background (doggy) layer. Put it on top of your text layer, then animate the mask on your foreground layer. So in total you have three layers:
V3 - foreground dog (masked)
V2 - text credits
V1 - background dog (and everything else)
(I reckon masking like this is easier in after effects but can be done in Premiere)
The K key is a modifier and stop playback key.
Play in reverse
To move the playhead in reverse at a normal speed, press J.
To move it backwards faster, press JJ.
To move backward slowly, press J and K.
To move back one frame at a time, press K and tap the J key.
To play in reverse slightly faster, press Shift + J.
To move the ...
I use Cinegy Daniel2 codec for editing in Premiere Pro. This codec take more space on disk, but work veeeeery fast compare to H264. Also it work more fast for me compare to ProRes.
Cinegy Daniel2 can be replaced with DNxHD MXF OP1a or MXF OP1a. Try these codecs. In Premiere it works very good.
You can convert all your raw files to one of this codecs before ...
Do you want to delete footages, which you didn't use in Premiere or you even didn't import them in Premiere?
In first case I don't know how to delete them.
In second case I think that you can look at the names of cache files, which premiere have created, then open program like "Beyond Compare", compare "video folder" with "cache folder" by names. And then ...
The problem is you don't have resolution for 700% upscale. ~~And aren't likely to find it in those tools~~ (strike that).
You can or may have already tried Video Enhancer. They claim to use Super Resolution to get the upscale possible. It doesn't suit all video sources. They have an AE plugin too.
If none of your searches for auto upscaling work then my ...
I think you can sort videos only in folders, then import sorted folders to premiere.
Maybe you can open playlist in video player, select all videos and copy/paste them all to new folder.
Also you can import all videos in Premiere Pro, then open folder by double-click on project panel and switch to preview mode. Then you can move mouse over clips, watch them ...
If you need to copy opacity effect with keyframes, you should select keyframes and press CTRL+C, then select clip on timeline and move playhead to time where you want to put first keyframe, then select effect controls window and click CTRL+V to paste. That's all.
In such way you can copy keyframes from one clip to another.
Why not import the folder into PP and watch and sort them in PP? After all that is the whole purpose of the application.
As you watch them you add the ones you want to the end of a timeline (hit the . key). This is called an assembly edit. Then you can trim your selected clips later.