agreed.

can you answer some ?'s

are you rooted?
has this always happened?
how long have you had the handset?

what troubleshooting steps have you done?

battery pull? data profile update from the settings menu?

did you recently do a PRL update?

add or remove any programs just prior to this occurring?

some reading: http://androidforums.com/htc-evo-3d/361521-streaming-media-tyrrany-sprint-proxies.html

called sprint to make sure your location is not under an issue?

do you get an error message?

can you upload anything else? photos? can you stream something from, say, youtube?

 

how large are the files?

 

are you shooting video from your handset? if so, is it 3D? 2D?

if its not a video you have shot on your handset, go ahead and make a small video form the handset and then try to upload/attach.

 

ok imma try this myself but first let me make sure i got you.

1. take some video form the evo 3Ds camera (2D)
2. attach it to a gmail account
3. send to someone

is this bascially what you are doing? does this happen on wifi as well as 3g/4g data?

 

ok. aplogies for the delay/

im home now and on wifi.

i just rolled over (still in bed ) grabbed the phone.. took a video of just stuff here.. it was a 30 second clip in 2D and about 11mb file size.

i renamed it to test so i could find it in the pile of other videos on the card.

went to my msn mail account on the handset. attached the video there. sent it to a gmail address i use.

in about a minute the video popped up in the inbox. it was in .mp4 format (this should not matter though).

so i was able to send the video no problem.

there must be something on your handset that us causing your issue.

remove the battery for 2 minutes. re install

try again.

if your on wifi (as i am ) to do this , there should not be anything holding you back.

i would double check the email address, etc.

if you are pretty much stock, you might keep the idea of doing a factory reset on deck...

 

you have a bad app install or something got tangled up somewhere else.

i would advise a factory reset at this point.

 

i have the camera settings to max on the evo i use and was able to send the file. there is a limit to how big of a file gmail will send.

 

look into SD and phone storage.

a factory reset will not erase anything on the SD card. it will return the phone to a factory state. most of your apps will re download but some may not. at this stage, a factory reset is a viable option.

 

i think gmail is larger. perhaps a quick google search will help. perhaps try yahoo also.

so if you are questioning the file size then it seems to be your handset is working fine. its just that you are trying to send a file that is too large to be attached to your email client.