android - Downloading an unsigned or unproperly signed apk file caused loss of data -

background:
* new developing android programmer/front-end web developer i'm not totally new sort of thing
* personal phone samsung droid charge, on verizon - unsure if matter or not.

problem:
seems have lost of photos , videos, i'm reaching out see if knows whether or not sure in trouble, or if there's still hope of recovering data loss.

what believe caused problem:
followed tutorial on how make simple hello world application, first step in learning how develop using eclipse. unfamiliar, @ time, signing applications. so, used apk in bin folder of project. placed onto web server using filezilla, , pointed phone browser file. downloaded it, when clicked on it, said along lines of "file big." or "application big." or "not enough room install." or along lines. application 28k, i'm sure had fact did not sign before attempting use on phone.

so - theory since looked @ "too big," removed other things on phone big, in order make room it. noticed phone forgot ringtone , other sound settings - because moved them 32gb micro-sd card (which came phone). previously, data stored on internal memory along photos , videos. - not able view files on internal memory when go "my files" apps. why happen, don't know - doesn't seem feature have. fellow developer @ office mentioned may verizon has set in place odd reason.

if photos still there, possible, i'm not sure how view them. gallery app not recognize files, , otherwise unable @ internal memory - using program called andexplorer.*

as new developer android, extremely frustrating. sure, perhaps should have backed data before testing app on own device, there's absolutely no reason should have happened.

i'm sure can't 1 has ever done this. tried searching issue on web , on stack overflow , not able find anything. , appreciated. , have learned lesson - need stuff before testing anything.

*edit: turns out can view internal memory using andexplorer, there doesn't seem on there, far missing photos , videos.

i placed onto web server using filezilla, , pointed phone browser file.

is web server configured proper mime type apk files?

but i'm sure had fact did not sign before attempting use on phone.

i rather doubt that. have explicitly things avoid signing apk.

so - theory since looked @ "too big," removed other things on phone big, in order make room it.

that seems unlikely. if true, question verizon/motorola, not stackoverflow, can end user device issues such lost data.

sure, perhaps should have backed data before testing app on own device, there's absolutely no reason should have happened.

it doesn't, in course of normal development.

i'm sure can't 1 has ever done this.

you person on face of planet photos, etc. lost or misplaced result of trying install hello-world apk.

and have learned lesson - need stuff before testing anything.

then did not learn lesson. need "stuff", period, unless somehow invulnerable , believe protection extend device. otherwise, rest of have phone accidentally dunked in toilet, run on bakery truck, caught in fireball triggered terrorist attack on natural gas pipeline, etc. and, in cases, lose data well.

in nutshell, android development not typically adversely affect device, not mere act of installing app. whatever problem have experienced due combination of events triggering bug in charge (possibly individual device).

btw, preferred way test app on device use usb cable, run eclipse on device itself. filezilla , downloading web can work properly-configured web server, that's reserved later in development process.