Pretty self explanatory don't you think? You can't send large files via MMS. There's a size limit (message>settings to see). So you have to send shorter vids, decrease the video quality or trim your video down so it's small enough to send.
My advice for very large files is to upload them to a cloud service like dropbox and send the link to the recipient. Otherwise, you have do either of the above options.
Can you be a bit more specific? Is this when trying to send an MMS? An e-mail? A Whatsapp message? In any case, every account has certain limits (especially MMS) when it comes to file sizes.
Well I just got this phone so I'm still trying to figure out how to use it... and I had an iPhone and I never needed to downsize a video.. so sorry for not knowing
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That's why I offered the resolutions. Keep in mind that if you are recording a full HD video (which is the default setting) for too long then it's going to get too large very quickly. I think 25MB is the limit when not on wifi. I forget the exact number but it's somewhere around that. An HD video passes 25MB very quickly. As an example I took a 2 min vid of my dogs playing and it was 232MB. Are you trying on Wifi and how large in the file you are trying to send? Just to help pinpoint.
I don't know how large or whatever all I know is that I can't send messages and I don't know how to change the format
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It's with email messages etc. But I used to have an iPhone and it never limited the size so is there anyway to fix it or use something else to message somebody or something. I'm still trying to get used to the phone
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Well that's why I'm asking. Trying to help you. If you want to see how large it is, go to your gallery, select it, hit menu key and details. This will show how large it is. Around here, if you want help, you have to provide more information. If not then no one can help you. And I suggested dropbox or other cloud in my first response. I provided you the basics around why your messages can't be sent but I was just trying to help identify your specific reason. But since all you know is you can't send, then good luck.