Importing table rates not working when using S3 storage adapter

[apachler]

Preconditions (*)

1. Magento 2.4.2
2. PHP 7.4
3. Activated S3 storage adapter in Magento

Steps to reproduce (*)

1. Export the tablerates.csv in Backend
2. Import the exported tablerates.csv in Backend

Expected result (*)

1. Uploaded tablesrates.csv file is processed.

Actual result (*)

1. File "https://[bucket].s3.eu-central-1.amazonaws.com/[prefix]/tmp/phpLjGmHf" not found.

Details

It seems there is a problem with the "uploadAndImport" method in "/app/code/Magento/OfflineShipping/Model/ResourceModel/Carrier/Tablerate.php".
It gets the path of the uploaded file from the $_FILES global variable and passes it to "$this->filesystem->getDirectoryReadByPath($dirName)" in the "getCsvFile" method.

Since the S3 storage adapter is active, this call is returning a location on the S3 bucket but the file is not existing there.
The file exists on the local filesystem located in the path defined by the PHP var "upload_tmp_dir".

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Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

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[m2-assistant]

Hi @engcom-Echo. Thank you for working on this issue.
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[magento-engcom-team]

✅ Confirmed by @engcom-Echo
Thank you for verifying the issue. Based on the provided information internal tickets MC-42520 were created

Issue Available: @engcom-Echo, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.