Credit: Taylor Kerns / Android AuthorityTL;DRYouTube mobile users on Android and iOS are reporting ads in the bottom-left corner that cannot be easily dismissed.The ads often remain after clicking “dismiss,” forcing users to wait 30 seconds or exit the video to clear them.The issue currently affects only free-tier users, with mobile browsers serving as a temporary alternative free of this particular annoyance.YouTube has long waged a war against ad blockers, and its subscription tiers, like YouTube Premium Lite, have also been recently upgraded to give users better value. However, a fair number of users do not mind sitting through an ad or two while watching a video. The patience of these users has been tested this week, as many are reporting a persistent, undismissible ad banner in the YouTube app.Don’t want to miss the best from Android Authority?