I use Dropbox to host photos. I started as a free user but went to paid when I reached the limit. I have almost a terabyte of rail photos and video, so the annual fee is worth the convenience of being able to access all my files from any device quickly as long I have a decent internet connection. Posting is pretty easy, but there is one trick, as I will explain.
Dropbox installs a folder on your PC. You store, rename, move, copy, delete and search for files in this directory like it was any other on your computer. I navigate using Windows File Manager to the image I want to post and right click on it. This options box appears:

Note the "Copy Dropbox Link" option. Click on that and then go to your post-in-progress here on the forum. Click on the "Img" box near the top of the "Post A Reply" window and paste the link between the bracketed {Img}/{Img} tags that appear. Here is an example (for the image above, as it were):

And here is where the trick is required. At the end of the pasted link, just before the closing tag, you have to replace the "dl=0" with "raw=1". Without doing this, the photo won't show here on the forum (I guess this is technically a hack, not a trick).
That's it. Doing the last step would be tedious if not for the fact that when you paste the link, the cursor is positioned just where you need to erase the "dl=0" by using the backspace key. I found that after posting just a few images that it had become fast and easy. I can type "raw=1" with in my sleep now. There is also a trick by which you can post an image full size, which I really like. I will show how that is done in another post.
Jim