Make your video fit under common attachment caps. Use 25MB (or 20MB for stricter providers).
Prefer the universal version? Open the all-in-one compressor preset to 25MB.
If your compressed result still exceeds your provider's cap, upload to Drive/Dropbox and paste the link. You can still keep the file to < 50MB for fast uploads.
Need Discord instead? Use the Discord tool or the 10MB target page.
Enter duration to see a recommended video bitrate for a 25MB target (adjust to 20MB if your provider is stricter).