The upload went through The ACOS went up The bid never actually changed That is
By Steven Pope · May 18, 2026 · Curated by George's Blog
The upload went through
The ACOS went up
The bid never actually changed
That is the trap
And it catches sellers every single time
The Operation column is blank
The upload runs
Nothing happens
Amazon processed the file
and ignored every edit
because there was no command
telling it what to do
No error
No alert
Just ACOS climbing while the problem is assumed solved
Amazon does not assume
It executes commands or it does nothing
Update means change the bid
Pause means stop spending on that keyword
Negate means never match that search term again
No command in that column means no action
Most bulk sheet mistakes are not strategy mistakes
They are execution mistakes
The thinking was right
The file just never told Amazon what to do with it
Every single row you touch needs an Operation
Not some rows
Every row
Pull the data
Filter for what is bleeding spend
Without producing orders
Decide whether to pause it or cut the bid
Set the Operation column
upload
Verify inside Seller Central that the changes actually landed
Brands that use bulk sheets correctly grow market share
Brands that skip the Operation column just think they do
Do not confuse uploading a file with optimizing a campaign
They are not the same thing