I suspect the package says U3, this is the quickest card available. Please follow the link, it has information the may help understand what you have received. https://shuttermuse.com/understanding-sd-card-naming-speeds-symbols/
I like my sd card with my gaaxy a5 phone very useful. You will be satisfied to us it. I Stored more than 10,000 songs, mp3 and more than 1000 mp4 as videos. And it's workng very well. I can use it with my tablet. And with my wireless headphone. I lov
I have a 256GB/MicroSD from Gigastone. If the Honor documentation says it will handle a 256GB MicroSD, it should be recognized by the phone and formatted for the Android system. It should ask to mount and format the card. So don't put data on the card other than testing it in a PC.