The original sentences seem to convey gratitude and clarify that the viewer can pause the video to read at their own pace. It also suggests that if the speaker had taken more time with the picture slides, the video would have been longer.
Here's a rephrased version for clarity:
"Thank you! Feel free to pause the video at any point to take some time to read. If I had taken more time with the slides, the video would have been even longer."