There are several ways to send big files for free.
However, it usually comes with a catch. You should keep this in mind.
6 ways to transfer large files to friends for free
If you do not want to spend anything, and for smaller files, the options above are serviceable.
For some of them, in particular those not offering any pro or paid plans, I would be very careful with. Storage in the cloud and security is very expensive. You should be careful to trust an organization giving this for free, unless they are a huge tech company which can afford to operate at a loss.
File Sharing for business is more than it seems
When you need file sharing for your business, either internally for your team and associates, or externally with clients (or both), you should consider a professional and paid subscription.
Most on this list do offer paid plans for professionals.
Another consideration is storage size and duration. Pay attention to how long you can keep files. With some providers you can keep files forever, and use this as an optional backup in the cloud.
Security and privacy are also very important considerations. Is the company taking security, with encryption seriously. Do they protect your files against hackers with secure authentication?
For businesses taking their files and data seriously, you could check a solution like SAM9000 Files.
This offers file sharing, security with full encryption. This cloud storage also offers durability, you can keep your files for backup. The maximum for transfers is 25 GB per file.
If you work typically on projects and your files are related to these specific projects, this kind of solution is far superior to those in this list. Project based file sharing also allows clients to upload large files directly to your business, so you can work on their projects.