Cannot add image (png, jpeg, etc.) but can add pdf, 403 forbidden when posting

  • I have a self hosted WordPress in a Google Cloud Virtual Machine. I am trying to add a media/image to a post. When I try to add the image, I will receive an error shown below. However, it does not happen when I add other media such as .pdf.

    POST?https://philsa.gov.ph/wp-admin/admin-ajax.php?403 (Forbidden)

    I tried using an inline image block, and tries inserting an image found on web. This can be added to the post. However, when saving the draft or publishing it, I will receive another 403 (Forbidden) error, this time in admin-post.php shown below.

    POST https://philsa.gov.ph/wp-admin/post.php 403 (Forbidden)

    I have posted this on WordPress Stack Exchange as well if you are interested in the images: https://wordpress.stackexchange.com/questions/425430/cannot-add-image-png-jpeg-etc-but-can-add-pdf-403-forbidden-when-posting

    The solutions I tried so far with no avail.

    1. Changing the permissions of wp-admin with chmod 755.
    2. Clearing my browser cache. The self hosted WP does not have a plugin for cache.
    3. Deleting the .htaccess removed the accessibility to the admin page. The page returns 404.

    Version: WordPress 6.3.4

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  • Deactivate all plugins as a test and switch to a standard theme such as TwentyTwentyFour. Does it work then? If so, then activate the plugins one by one and then change the theme again until you have found the culprit.

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