After adding the 'edit_posts' capability to 'subscriber' and turning off, the added role still remains

[DJviolin]

// Add capabilities to "subscriber" user role
add_action('admin_init', 'subscriber_role_upload_files');
function subscriber_role_upload_files() {
    $role = get_role('subscriber');
    $role->add_cap('upload_files');
    //$role->add_cap('edit_posts');
}

After adding the 'edit_posts' capability to 'subscriber' user role and turning off, the added role still remains. This code presented in a child functions.php file.

[knutsp]

From codex regarding add_cap:

NB: This setting is saved to the database, so it might be better to run this on theme/plugin activation

[DJviolin]

But I need edit_posts for the media uploader to work properly with 'subscriber' users at frontend (with Theme My Login plugin). if I not give this role to subscribers, the "crunching" will hang at image upload.

[knutsp]

Hello @DJviolin

Welcome to Trac

I'm sorry, but I not quite sure I understand your problem.

If you need to add capabilities to roles, I suggest a role manager or capability manager plugin. A theme should not make permanent changes to roles on every page load. Capabilities may be manipulated from functions.php using the map_meta_cap filter.

Since I can't see any indication of a core bug in your report and latest comment, I have to suggest you try our support forum ​https://wordpress.org/support/. The people there are most capable of helping you do what you want the right way.

If it should later become evident there is, or may be, a bug in core, please feel free to reopen this ticket.

[DJviolin]

I found the solution here:
https://core.trac.wordpress.org/ticket/19834#comment:19

I modified to my needs:

function fix_media_permissions() {
    global $wp_post_types;
    $wp_post_types['attachment']->cap->edit_posts = 'upload_files';
    //$wp_post_types['attachment']->cap->delete_posts = 'upload_files';
}