データのサイズが違っていました。修正して再送してくださいって英語でなんて言うの？

▪ Hi, the data that was sent to me was incorrect. Can you kindly rectify it and resend it.
sent is passed tense for send.
incorrect is wrong.
rectify is correct what was incorrect.

This sentence is saying that the data was wrong and that they must correct it and send it back.

1. The data that you sent me in the email was the wrong size, please resend it with the correct size
   data.
   This statement is telling the person that the data sent was incorrect and you would like them to send the correct thing.
   The word "resend" means to send again.

This expression is telling the other person that the data size is incorrect. What is important about phrasing it like this is that you are telling them the size they sent the file, and the correct size in which they should send the data. They may not have noticed which size they sent the original file.

Constraint - a limitation or restriction, restriction, limitation, curb, check, restraint, control, curtailment, damper, rein; hindrance, impediment, hampering, obstruction, handicap
"Time constraints make it impossible to do everything."
"The availability of water is the main constraint on food production."
To bear in mind - to bear in mind. or to keep something in mind. If you tell someone to bear something in mind or to keep something in mind, you are reminding or warning them about something important which they should remember.

To shrink something- this means to make it smaller by any means
To make (something bigger)- this means to grow something by some amount.

A. Why is your shirt so small? Did you get the wrong size.
B. No man, I accidentally shrunk it in the dryer.
A. Too bad! Next time pay attention to your clothes when you're drying them.
B. Well, duh. Thanks for the sage advice, but you're too late.

"Please resend as originally requested:"...would cover the point to be made here!
We sometimes need our specifications to be exact ...and in this case you need to be sure that your "original reques"t is being honored.
"The data that arrived is not to my specifications....Please resend as originally requested. "

This is a tricky question. Without knowming more about the data, the best way to talk about data is to use the word "format". Format is a bit of a generalized term that can be used to describe the shape, size or orientation of something. In this case, data.

All three of these sentences use the word format with a negative tone. They will express to your partner that there was a problem with the data.