Staff are just like your customers and will need to be guided and possibly even pushed into uploading photos. Don’t forget that you want them to be doing it all the time not just a one off. Firstly look at building this into their job description - upload one image per day. Consider a competition or incentive for your staff. Content is king so photos you get in are valuable and valued. Ask the CEO to endorse your marketing strategy. If the boss is uploading content then the team will too.
Shutterock software makes it easy to upload images and our smart phone apps mean there are no excuses - its easy! Finally make sure you celebrate and thank your team for their support and direct them to look at the content boards.