Improve the site on Bitrix

As a result of the unscrupulous work of the performer, we cannot start full-fledged work on the site - we need to bring it to full readiness. Also configure the upload of files in xml format by analogy with the existing one.
It is necessary to correct the shortcomings and bring it into full compliance with the project. The attachment contains a file with the necessary fixes.
IMPORTANT: to stay with the Contractor in a partnership for a long time, because it is constantly necessary to add something, correct, etc.