Speakap allows videos up to 1GB (1024MB) in size. A maximum of one video may be added to an update.
If you add the video file as an attachment to an update, the maximum size is 256 MB.
Please note: for larger video files, it may take a while before your upload is ready due to the size. Uploading video may therefore take a little longer than you may be used to.
So to also give you a tip: use a video compressor to reduce the size of the video without losing its quality. The speed of uploading and transcoding of the video will then also increase!