constant STREAM_WRAPPERS_WRITE_VISIBLE

file_add_form_submit in core/modules/file/file.pages.inc

Submit handler for the add file form.

file_add_upload_step_scheme in core/modules/file/file.pages.inc

Generate form fields for the third step in the add file wizard.

file_field_settings_form in core/modules/file/file.field.inc

Implements hook_field_settings_form().

file_get_stream_wrappers in core/includes/file.inc

Provides Backdrop stream wrapper registry.

file_is_writeable in core/modules/file/file.module

Check if a file entity is considered writeable or not.

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