in autohotkey not all send tabs are working - macros

Question

i was trying to make a .ahk to macro a gif making, uploading, and url coping but it often times ignores keystrokes like send, {tab down}{tab up} which compleatly breaks the macro. also send, ^L isnt working when i send it in the middle of the string
^q::
Run, firefox.exe "gifcreator.me"
sleep 9000
Loop 9
{
Send, {tab}
sleep 100
}
send, {enter down}
sleep 500
send, {enter up}
sleep 200
Loop 4
{
send, {ctrl down}
send, ^L
send, {ctrl up}
}
sleep 200
send {ctrl down}
send, a
send, {ctrl up}
sleep 200
send, {delete down}
sleep 200
send {delete up}
sleep 5000
send, C:\Users\John Reuter\OneDrive\art
sleep 300
send, {enter down}
sleep 500
send, {enter up}
sleep 5000
click 1200, 50
sleep 3000
click 1200, 50
sleep 200
send, {ctrl down}
sleep 200
send, v
sleep 200
send, {Ctrl Up}
sleep 13000
click 50, 150
sleep 3000
send, {Ctrl Down}
sleep 200
send, a
sleep 200
send, {Ctrl Up}
sleep 200
send, {Ctrl Down}
sleep 200
send, a
sleep 200
send, {Ctrl Up}
sleep 7000
send, {enter}
sleep 5000
send, 5
sleep 200
send, 1
sleep 3000
send,^{ctrl down}-{ctrl up}
sleep 3000
send,^{ctrl down}-{ctrl up}
sleep 3000
send,^{ctrl down}-{ctrl up}
sleep 3000
send,^{ctrl down}-{ctrl up}
sleep 3000
send,^{ctrl down}-{ctrl up}
sleep 3000
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 300
send, {down}
sleep 3000
click 567, 227; miss
sleep 3000
send, {Ctrl Down}
send, f
send, {Ctrl Up}
sleep 3000
send, download gif
sleep 5000
send, {enter}
sleep 5000
send, {Ctrl Down}
send, l
send, {Ctrl Up}
sleep 5000
send, giphy.com/upload
sleep 3000
send, 2
sleep 3000
click 642, 325
sleep 8000
send, {down}
sleep 3000
send, {right}
sleep 3000
send, {down}
sleep 3000
send, {right}
sleep 3000
send, {down}
sleep 3000
send, {right}
sleep 3000
send, {down}
sleep 3000
send, {right}
sleep 3000
send, {enter}
sleep 7000
send, {Ctrl Down}
send, f
send, {Ctrl Up}
sleep 3000
send, upload gifs
sleep 3000
click right 661, 198
sleep 3000
click 713, 218
sleep 3000
send, {Ctrl Down}
send, l
send, {Ctrl Up}
sleep 3000
send, {Ctrl Down}
send, x
send, {Ctrl Up}
sleep 3000
send, <img src="
sleep 3000
send, {Ctrl Down}
send, v
send, {Ctrl Up}
sleep 3000
send, "alt=""style="width:12px;height:18px;">
;======================
Esc::ExitApp

Answer 1

Instead of sleeps, try using WinWait etc. Look in AHK help file how the commands (Run, WinWait etc.) are properly used.
SetTitleMatchMode, 2
Run, firefox.exe "gifcreator.me"
WinWait, Online Animated GIF Maker
IfWinNotActive, Online Animated GIF Maker, ,WinActivate, Online Animated GIF Maker
WinWaitActive, Online Animated GIF Maker
sleep 100
Loop 8
{
Send, {tab}
sleep 100
}
Send, {Enter}
; WinWait, ...
; IfWinNotActive, ...
; ...
; SendInput, C:\Users\John\OneDrive\art
; ...
EDIT
If the next window doesn't appear after the first "Send, {Enter}", try using a loop:
SetTitleMatchMode, 2
Run, firefox.exe "gifcreator.me"
Loop
{
WinWait, Online Animated GIF Maker
IfWinNotActive, Online Animated GIF Maker, ,WinActivate, Online Animated GIF Maker
WinWaitActive, Online Animated GIF Maker
sleep 100
Loop 8
{
Send, {tab}
sleep 100
}
Send, {Enter}
sleep 1000
IfWinExist, title of next window
break
}
; WinWait, title of next window
; IfWinNotActive, ...
; ...
; SendInput, C:\Users\John\OneDrive\art

Answer 2

Why are you putting a comma after Send? That is not proper syntax. These examples from the AltHotKey website would be the proper syntax for your commands:
Send {b down}{b up}
Send {TAB down}{TAB up}
Send {Up down} ; Press down the up-arrow key.
Sleep 1000 ; Keep it down for one second.
Send {Up up} ; Release the up-arrow key.
Check their web page for more details about the Send command: https://www.autohotkey.com/docs/commands/Send.htm