I want to share files with colleagues on dropbox. what's the preferred way?

I would start by making sure the files were shared files that were removed by someone else.

Secondly, check out the dropbox website for other scenarios in which files can not show up. https://www.dropbox.com/en/help/969

If you are unable to get the files back after verifying your files and/or visiting the page above you may need to contact dropbox for help.

https://www.dropbox.com/support

Hope that helps!

if u have the actual video file, attach it to an email and send it on to whoever you want to.
However, this may be a problem if the video file is too big.. in which case, you should store it on a server somewhere and send the link to the video to whoever you want to share it with something like Dropbox.

Once you sign up for a free 2GB Dropbox account, you can get get a further 250MB by just completing the following via the "Getting started" tab at the top of the screen:

1. Take the Dropbox Tour
2. Install Dropbox on Your Computer
3. Put Files in your Dropbox Folder
4. Install Dropbox on Other Computers You Use
5. Share a Folder with Friends or Colleagues
6. Invite Some Friends to Join Dropbox
7. Install Dropbox on Your Mobile Device

Try and use another browser like mozilla or Opera. It happened to me once

Here are three ways:
1. If on the same network, create a smb share on the macintosh, map the share on the windows system.
2. Format a usb drive on the macintosh using disk utility as a FAT partition. Copy the files to it. Dismount the drive. Mount the drive on the windows machine.
3. If both have access to the Internet, crete a free 2GB DropBox account. Drop the files in the dropbox and it will be copied to the dropbox on the windows pc.