The issue has nothing to do with the source code of a theme or plugin or with the configuration of WordPress. It is:
- a 6+ months old bug in File block in Gutenberg that narrows down to
- a 4+ years old bug in core WordPress.
No solution exists for the moment, except for uploading files via Media section of WordPress Dasboard. As file upload through that way are 100% working without any problems.
Related Posts:
- How can I customize the upload error message in WordPress?
- How to set Media Box form elements default value?
- Is there a way to send HTML formatted emails with WordPress’ wp_mail() function?
- Why do some hooks not work inside class context?
- Hook after image is uploaded and image sizes generated
- Do WordPress Core Filenames Work as Hooks?
- How to call a REST endpoint when a post is published?
- __NAMESPACE__ with register_activation_hook
- Missing a temporary folder despite settings in wp-config.php
- Hook for URL Request
- Saving the pre-sanitized filename of an attachment as the Title or Caption
- Hook/notify when any option or setting is added or updated
- Is it possible to save/modify a post without calling the “save_post” action hook?
- Which hooks is this? add_action(‘wp’,
- Hook filter to change wp_upload_dir() path in multisite
- admin_notices after register_uninstall / deactivate_hook
- add_action on inherit post status
- Why does wp_enqueue_script ignore my ‘wp_head’ hook?
- action lifecycle
- Redirect users on specific post category or category page
- Returning ACF custom field from publish_post
- How to modify an add_action() inside a loop of core function
- Add custom URLs to WordPress’s XML sitemap
- What is the best filter where to use register_block_type?
- How get list all users who edited post?
- Stuck in redirect loop after using wp_login action
- Hooks for Links Box [duplicate]
- Why doesn’t wp_enqueue_script() work when including a JavaScript file with TEMPLATEPATH?
- Check if do_action(‘custom_action’) is hooked into?
- Hook after wp_enqueue_scripts
- Detect change to user_meta and retrieve old and new values
- wp_login Action hook with conditional tag
- Can I remove WooCommerce main content hook?
- How to alter the query using pre_get_posts hook and is_post_type_archive
- How to update WordPress core or themes and still have my child theme hooks work
- Proper indentation of code generated inside hooks
- Featured Image Action Hook
- Add parameter (time) to oembed
- How can I count post views of REST API calls and update them in an ACF field?
- Event-Driven Pattern vs MVC?
- Using hooks with extra parameters
- How to catch and modify custom field values when a page is updated
- Genesis: How to add content after aside and before the content-sidebar wrap
- new_to_publish fires multiple times
- Plugin init hook
- Best action hook for placing ical requests
- Is there a hook that fires when a row of wp_sitemeta table is updated?
- `rest_user_query` can’t access post author in post edit screen
- Post Meta Emtpy on Publish Using Transition
- How to check post type when using sanitize_title hook?
- How do I trigger a post update within a get_posts() foreach loop?
- Duplicate Cron Jobs Using wp_next_scheduled / wp_schedule_event
- Adding a hook to the default (page.php) template
- Hook when editing user
- get_post_metadata causing some meta data to fail
- How to change the default mail when admin approuved an user?
- How to modify how the_content outputs a link to an internal page
- read more, even if excerpt not trimmed
- Using delete_attachment to prevent an attachment not working
- How does do_action( ) works actually?
- Giving the_excerpt in the place of the_content?
- Hook to init or call explicitly within functions.php
- How to add content to the end of a page with a hook?
- Woocommerce table is missing a heading–can I add it by use of a hook?
- WordPress’s “Text” Format
- run script on publish
- Calling add_action on a filter hook?
- Remove Header and Footer if user is not logged on
- hooks for automatic approve user registration according to data in custom fields
- How to render an element, that was saved as a template, using a hook?
- What is deprecated_argument_run meant to do exactly?
- How do I run an action after a featured image has been selected in the Gutenberg editor?
- FTP + Unable to locate WordPress content directory (wp-content)
- How to run a function after wp() in the wp-blog-header.php file?
- WordPress cronjob get scheduled but function does not run
- How to add a HTML element in ADMIN edit post window?
- wp query add array by if condition
- Gravity Forms | Form Object is NULL [closed]
- Change status of page after an event (Looking for best practice advice)
- Add action save post when create and publish
- Hooks for Start/End of Batch Plugin Updates in wordpress
- How to load another post if condition is true
- Struggling with plugin dev basics: add_action
- RTrouble passing arguments to action
- delete_user hook failed
- Which things should be called with `after_setup_theme`?
- Changing header logo href for the checkout page
- Prefixing widget_posts_args Hook
- Can’t get ID of post that relates to the comment
- Updating user meta data from external link, user not logged in
- Remove lines from RSS Feed
- Is there a hook that triggers when grant secondary user role in WordPress?
- How can I insert custom html code inside a div dynamically?
- How WordPress understands what do with the (all) key in the $wp_filter array? [duplicate]
- WP-Automatic to run publish hooks
- When is get_currentuserinfo() needed?
- Hide post completely and still reach it via cURL
- Problem in register activation hook and Copying folder
- Why does hook priority affects admin menu permission error?
- add_action failed to display function by a plugin