1. Yes that's an animated GIF image, currently powpress doesn't support videos. I'll try to use static images more in the future.
2. The file name as transaction IDs is intentional design decision. By using the transaction ID every file has a globally unique identifier, which makes it possible to replicate them in a distributed manner and find them later easily. But I will think about a convenience feature for when you download files when I get time. Technically it might be possible to extract the file header and automatically fill in the file extension when you try to download.
1. Yes that's an animated GIF image, currently powpress doesn't support videos. I'll try to use static images more in the future.
2. The file name as transaction IDs is intentional design decision. By using the transaction ID every file has a globally unique identifier, which makes it possible to replicate them in a distributed manner and find them later easily. But I will think about a convenience feature for when you download files when I get time. Technically it might be possible to extract the file header and automatically fill in the file extension when you try to download.