Is this allowed?

[Tarmack]

paid the royalty fee for the clip and attributed the author

They require a one time fee AND attribution? That's weird.

 

[mindway]

Pond5 is a Royalty-Free clip site that I use all the time. As long as you have paid the royalty fee for the clip and attributed the author of same as stated in their license terms, you will be fine. If you are using their free Public Domain clips, stating that in your credits will help.

Also you cannot just upload the clip as a standalone; it must be a portion of a larger authored video.

how much it cost the royalty fee ?

 

[LionWaffles]

Pond5 is a Royalty-Free clip site that I use all the time. As long as you have paid the royalty fee for the clip and attributed the author of same as stated in their license terms, you will be fine. If you are using their free Public Domain clips, stating that in your credits will help.

Also you cannot just upload the clip as a standalone; it must be a portion of a larger authored video.

Like @UKHypnotist said, as long as it's royalty free, it is not just that you're uploading, and you attribute it, you're completely safe.

When you are looking in the video manager and changing music of your video within YouTube, if there is a person symbol there, you must attribute it in the description or the title.

 

[UKHypnotist]

how much it cost the royalty fee ?

The fee varies from clip to clip; the price will be on the individual clip page.

They require a one time fee AND attribution? That's weird.

@Tarmack Actually, It's not weird at all; it's becoming more and more common on RF sites where authors are allowed to submit their own work rather than being paid a bulk fee for a batch.