Why are my photos being cropped?

Here's the image I posted yesterday (that you didn't see or ignored). Where are these black bars at the top and bottom?

I'm seeing the still full height with black lines either side, just as I would expect.

Alright, I'm still convinced that nothing is wrong here and it's just the way the player is scaled, and this is just what happens when you mix and match different scales and different video aspect ratios on different montiors.

In VLC player go to Video > Aspect Ratio and click "Default." It might already have a dot next to it, but try clicking it anyway and see what happens.

You don't need to change your sequence settings if you want to edit in 2.7k, but that's not a common resolution to edit in. Typically you would scale that footage down to 1920x1080 or use the extra resolution for image stabilization, but I won't go into that since this is already confusing enough.

I really don't know how to put it any other way. If you import your finished and exported video back into Premiere and it looks good, then the video is not the problem. If it looks correct on YouTube and it looks identical to how Premiere displays it while editing and how the Export Settings dialog shows the preview, then the video is not the problem. It's possible that the player doesn't like the resolution your video is and is doing something funny, which is why I suggested viewing it in VLC player. Can you open the video in VLC, don't resize the player at all or make it full screen, and post a full screenshot of your entire monitor? Presumably, the video player won't be taking up the full screen here and part of your desktop or taskbar will be visible.

Correct, a sequence is the all-encompassing thing that holds your media, i.e. your timeline. Yes, sequences have their own settings, and yes, it was automatically set to 2.7k if you dragged a video clip to the Timeline area to create a brand new sequence. 

You didn't answer my question, though, when I looked at your video on YouTube and the screenshot you posted after you had imported your finished video back into Premiere, everything looked correct. Is that the case? 

I really think the display issue you're having goes back to you editing at a non-standard frame size. I just downloaded your video from YouTube and it came down as 1920x1080, which is not the resolution you uploaded. I think you would have more luck if you created a new sequence at 1920x1080, copying the contents of your current timeline to it, then resizing each clip as you need (you can batch select clips and choose "Set to Frame Size"), then exporting again. I really think this will help.

In one of the more recent images you imported the final video back into Premiere in your original sequence; you also uploaded the video to YouTube and there's only letterboxing, so nowhere except that first image in the media player do I see bars on the top and bottom, which is why I said that I thought it was just how your player was displaying things. 

Does the video not look correct to you on YouTube?

Sorry, but I'm a little confused now. I thought you said you were expecting to see the black bars on the left and right, but the problem was that you were seeing them on the top and bottom when you exported them. That last screenshot you posted, and even the one on YouTube shows pillarboxing (bars on the left and right) which is exactly what's showing in your Premiere timeline in your original screenshots.

You also get a preview in the Export Settings dialog when you adjust your settings.

Is the issue that the intro image isn't filling the frame? If so, that goes back to my earlier post that Set to Frame Size is going to fit the entire image to your sequence, not fill it, and if you want to fill the whole frame with your image you have to open the Effects Controls panel and scale it up there. If this isn't what you want, then I'm missing something else, sorry.

I think you're already doing it. Judging by the screenshot of the Export Settings dialog you posted, your Output resolution matches your Source resolution, which is why I said I think it might be your player that's the problem. You need to view your video somewhere else to confirm that the black bars on the top and bottom aren't actually part of your video. You can try installing VLC player (https://www.videolan.org/vlc/index.html), or like I mentioned, drag the exported video back into your editing timeline to see if there are black bars on the top and bottom there. If not, then the bars aren't part of your video and are only showing up based on how the video player is sized.

And you're not wasting our time, I just think you'll have better luck if you start learning some fundamentals.

But looking at your screenshots (and thanks for embedding them this time), it looks like you are exporting your video that matches your sequence settings. In that case, I think it might be your player. Have you shrunk it down or stretched the video player out so it's more of a rectangle? It could just be how the interface of the placer is working. I would try a different player, upload the video to YouTube, or import it back into Premiere and stick it at the end of your working timeline. If it fits and matches the content of your timeline perfectly, then it's just the player. 

You're still editing at a non-standard frame which could cause problems depending on what you want to do, or it might be just fine, it's always hard to tell without more detail.