Please check you iMovie library, if that is below 2Gb then you can send it via Dropbox for me to edit. If you have several iMovie projects on the same library that makes it 10GB or more. You need to create a separate library so you can share it with me. On iMovie, go to File menu > Open Library>New
then after you have created a new library. Go to Projects tab, and right-click on the project you want to send me, and click Copy to Library - pick your new library name. Then back on the Media tab, right-click on the Library then >Reveal on Finder. Drag that new library to Dropbox...
If you can do that part, then I can do my job. ;) Looking forward to work with you!