I regularly send large video files and photos to friends via Dropbox even though they do not necessarily have a Dropbox account. The way to do it is by sending your family/friends a direct link to where the photos, in your case, are stored in your account on the Dropbox server out there in "the cloud". This means that the photos are downloaded from the server (wherever that is located) to your family and friends computer(s) when they click on the link you send them via normal email. I copy the link ( Ctrl-C ) and paste it into the email I am composing (Ctrl-V).

If I'm sending a number of photos or video to the one person, I create a folder, suitable named to distinguish it from others, in which to store them in my local Dropbox folder which resides on my computer. All the files I want to share are then placed into that folder. Dropbox will replicate what I have done on my local Dropbox to my account on Dropbox's server out there somewhere.

So the upshot of this approach is that the third parties download your folder with contains all the files from the Dropbox server. How fast the downloading occurs is a matter for your family/friends internet connection and has nothing to do with your internet connection other than you getting the folder and contents uploaded to the server in the first place. This uploading happens once only plus any time you make changes to the contents of the folder.

The Dropbox help files should give you a suitable guide on how to create a link to your folder. Setting up the link is done through your account on the Dropbox server.

You should consider the details of this post Recommended resizing parameters for digital images

By sending lower resolution files, you save yourself significant time when sending the image files to a share-site and you save your family significant time during the download, while sharing digital images that are visually equivalent when viewed on a computer. The post includes multiple screen-captures of popular editing software, where hopefully your reference to "export" applies to one of the edit software shown.

Dropbox does not convert images. If they are getting unprocessed files at the other end, then you probably put your unprocessed files in your Dropbox folder. Does your daughter have Dropbox on her computer? Are you sharing a specific folder, or are you using a specific folder inside of the Photos folder and sharing that? Either way, what she sees at her end will be exactly what you put in at your end.

When I share images by dropbox - and I do this at least several times a week - sometimes as many as 400 or 500 files - I encourage to install Dropbox on their end. I then create a folder with their name and my name on it in my Dropbox folder, and invite them to share that folder through Dropbox. Then whenever I put anything in that folder Dropbox will sync up with that folder on the destination computer.

The speed of connection on my end is pretty fast, and usually it's at least 100 mbps at the other end. Naturally, if you have a slow connection, say 15 mbps it will take longer. If you both have slow connections, then it will take longer to upload AND download. WeTransfer or any other similar program is not going to solve a slow connection issue.

You could downsample your images to 2048x1280 which will give you files that are between 1 and 2 mb in size, and those will transfer very quickly.

Over the years I have read a number of pros and cons on this site regarding the use of UV filters for lens protection. Personally, I have always used one, and never gave it much thought. A couple of weeks ago when I was unloading my car for my granddaughter's birthday, my camera bag fell out of the back of my SUV. My lens was attached to my camera. The lens cap broke, and the UV filter was smashed to bits. However, the lens was completely in tact, with absolutely no damage! And, no damage to the camera (which had nothing to do with the filter). Lucky me! I immediately bought a replacement UV filter!