Three AutoIT script causing issue - selenium

Question

All,
I have Selenium script which attach documents to Transaction. I am using AutoIT. Now, the problem I am facing is: I have to attach 3 documents (one by one). My steps are: I execute AutoIT script. Then script click on Browse 1 - button in my transaction screen - File Upload pop up appears. My Address of file is pasted correctly in text area as well.
But when AutoIT script click on Open button - another File Upload window appears.
I did added some wait in my script before clicking on Browser 2 button. But somehow I am missing something which is causing this problem.
Another thing is that: Same script works sometimes. Failure is more than success.
WinExists ("TITLE")
While 1
Select
case WinExists("File Upload")
WinActivate("File Upload")
Sleep(5000)
Local $sTestPath = _PathFull(#ScriptDir & "\ABC.jpg")
ControlClick("File Upload", "", "Edit")
Send($sTestPath)
Sleep(5000)
Send("{ENTER}")
Sleep(5000)
Exit
Case WinExists("Choose File to Upload")
WinActivate("Choose File to Upload")
Sleep(5000)
Local $sTestPath = _PathFull(#ScriptDir & "\ABC.jpg")
ControlClick("File Upload", "", "Edit")
Send($sTestPath)
Sleep(5000)
Send("{ENTER}")
Sleep(5000)
Exit
Case WinExists("Open")
WinActivate("Choose File to Upload")
Sleep(5000)
Local $sTestPath = _PathFull(#ScriptDir & "\ABC.jpg")
ControlClick("File Upload", "", "Edit")
Send($sTestPath)
Sleep(5000)
Send("{ENTER}")
Sleep(5000)
Exit
EndSelect
WEnd

Answer 1

Don't use send.
Send ( "keys" [, flag] ) - Sends simulated keystrokes to the active
window.
Better way:
ControlSend () can send characters to targeted window (can be inactive).
Most reliable way:
ControlSetText () - Sets text of a control.
Play with AutoitWindowInfo tool and tweak the script below if needed.
#RequireAdmin ;Will give your script a permission elevation (sometimes its needed)
Opt("WinTitleMatchMode", 1) ;1=start, 2=subStr, 3=exact, 4=advanced, -1 to -4=Nocase
Opt("WinSearchChildren", 1) ;0=no, 1=search children also
WinActivate("File Upload")
WinWaitActive("File Upload","",10)
ControlFocus("File Upload","","Edit1")
ControlSetText("File Upload","","Edit1","dropdowns.jpg")
ControlSend("File Upload", "", "Edit1", "{ENTER}")