I didn’t understand the firs question,about the sound you can use the watermarked versions,and put a link to the item page in your description.most of Audiojungle find it okay when Videohive authors use their files,but it still preferable to take permission from them,there are some authors that allow that without permission.and make sure to not include the watermarked file in the main ZIP.
First week of June was so terrible
The Legend of Zelda series,and Metal Gear Solid series .. all of them
Second best month in term of sales and earnings.
For some reason sales stoped in the last few days.