how to insert the sd card in the fire tablet?

Combining the good advice given by others into one answer: (i) The SD card slot is located on the top right edge of the FIRE tablet (ours is a Fire HD 10 - 9th Gen -2019) under a plastic lift up tab. (ii) with the tablet screen up and camera at the top, insert the SD card into the slot with the "gold teeth" down. (iii) push in the SD card, but don't force (in case you have it in backwards). I was not able to get the SD card to "click" into place until I used the pointy end of a letter opener to gently push the SD card all of the way in. (iv) Once the SD Card was recognized by the the tablet, I was able to go to SETTINGS > STORAGE > SD CARD, FORMAT AS INTERNAL STORAGE. Other options are available at this same place in Settings, but for me, that was all I needed to do.

Does anyone know if this card comes with any kind of warranty? Ours stopped working for no reason. The tablet can't read it anymore. :(

I've had this same issue myself. Please don't just jump to the conclusion that it's an Amazon problem, a SanDisk problem and/or both. I've experienced this same issue with the "Made for Amazon" 16, 32 and 64GB cards. I've also had the same experience with higher end cards made by PNY, Samsung, Lexar, Transcend and Sony cards. I've had this same problem with everything from 2015 Fire 7 8 and 16GB models to the current 2017 Fire 7 and HD8 models. I've also had the same experience with my Samsung Tab4 and my Samsung E9.6 which I just purchased last fall. In a nutshell it doesn't seem that any tablets are quite ready to reliably store apps on external (SD card) memory. As at least one other said, try recycling the power if the apps disappear. It may take multiple times. It also may not work at all. I have gotten lucky on one occasion that I was able to restore by moving the app back to tablet storage. Many times I have gotten a message stating that the file does not exist or no longer exists (something to that effect). I will warn anyone using a non-Kindle Fire tablet who are using their Amazon apps on it to NOT move any of those to external storage. Most likely the first time you recycle the power (restart or have battery die while using and turn back on after charging) you will find that many of the Amazon apps are gone and will be unrecoverable other than redownloading. If that happens any progress made in a game or customization done in an app will be lost. To be safe only use the SD card/external storage for music, photos and videos which can be redownloaded if necessary. Anything not backed up in the c!oud which is the only copy should be backed up to another location. It's just good practice these days to keep an archive backup of anything important anyways as it will make restoration both easier as well as possible in addition to avoiding the loss of unrecoverable data which may be anything from sentimental family photos to vital business data. Keep in mind too the cost of these devices as well as the memory cards. Even my $1000+ iPad pro can lose data/files if I don't regularly back it up to iCloud. I still periodically hook it up to my computer to perform a backup to file which I then duplicate to a USB drive for storage in a fire safe just to ensure that my critical files are safe (or as safe as can reasonably be without going to extreme measures). Cheaper devices and memory means more likely the potential for failure. Redundant backup is the only way to help ensure that you can restore your device in the event of failure and/or corruption. Hope this helps. Also, Remember that depending on the sale at the time you can buy 4-5 Fire 7 devices for what just one cost only a few years ago. With memory cards these days 64GB cards are selling for less that what an 8GB card cost when the first Kindle Fire came out. Enjoy what the advancements in technology over just the past several years has made possible to all of us.

can I use a commercial sd card?

You can but it doesn't run as well. You want a class 10 micro SD card or you will be experiencing some delays and difficulties using certain apps. I learned my lesson!

will it work with fire hd 7, i ordered the 64gb but can't find were to install it

The Fire HD 7 does *not* have a slot for micro-SD cards. You can order it with 8 GB or 16 GB of internal storage. In practice, this is not so bad since you can use Amazon Cloud Drive to store content, especially music and video.

Color	Grey
Special Feature	Temperature Proof, Water Proof
Item Weight	0.01 Pounds
Warranty Type	Lifetime
Write Speed	10 MB/s
Hardware Interface	MicroSD
Secure Digital Association Speed Class	Class 10
Product Dimensions	0.59"L x 0.43"W
Manufacturer	SanDisk
UPC	619659179212
Item model number	SDSQUNB-256G-AZFMN
Item Weight	0.16 ounces
Item Dimensions LxWxH	0.04 x 0.59 x 0.43 inches
ASIN	B08JGHVW46
Date First Available	September 17, 2020

Made for Amazon SanDisk 256GB microSD Memory Card for Fire Tablets and Fire -TV

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