Magento

How To Fix “Invalid parameter given. A valid $fileId[tmp_name] is expected”

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A valid $fileId[tmp_name] is expected” In Magento 2.3.6

Here I am using localhost, for the server you still use this path to the File directory.

Step 2: Open Uploader.php.

Open Uploader php file
Please note that this is the source directory of Magento 2, to edit it you must grant administrator privileges.

Step 3: Scroll down to line 589.

Comment line 589
Replace

$this->validateFileId($fileId);

to

//$this->validateFileId($fileId);

Step 4: Save change.

Run upgrade and compile command

php -d memory_limit=12G bin/magento setup:upgrade
php -d memory_limit=12G bin/magento setup:di:compile

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