You find some problem to send email with attachments and uploading a big file with php scripts.
These problem comes because php upload limit set in php.ini file.

Thia is not a big problem you can fixed it in just a few…

Step 1 : Go to right side task manager and click on php..

Step 2 : You will find php.ini open it.

Step 3 : In this php.ini file search (upload_max_filesize) you will find some thing like..
Maximum allowed size for uploaded files.
upload_max_filesize = 64M

Maximum number of files that can be uploaded via a single request
max_file_uploads = 20
Step : You need to increase the size of both the file

Note : Technically, Man_file_uploads should always be larger than upload_max_size. But for large numbers like 100myou can safly make them equal.